#ifndef SorahISA
#define SorahISA
#include SorahISA __FILE__ SorahISA

void solve() {
    int N; cin >> N;
    
    vector<pii> children(N); cin >> children;
    vector<vector<pii>> adj(N); /// (x, ban_id)
    vector<bool> is_ban(N-1, false);
    for (int i = 0, tok = 0; i < N; ++i) {
        auto &[lt, rt] = children[i]; --lt, --rt;
        if (lt != -1) adj[i].eb(lt, tok), adj[lt].eb(i, tok), ++tok;
        if (rt != -1) adj[i].eb(rt, tok), adj[rt].eb(i, tok), ++tok;
    }
    
    vector<int> sz(N), par(N);
    auto get_centroid = [&](int root) -> int {
        int centroid = -1;
        par[root] = root;
        function<void(int)> dfs1 = [&](int now) {
            sz[now] = 1;
            for (auto [x, ban_id] : adj[now]) {
                if (is_ban[ban_id] or x == par[now]) continue;
                par[x] = now, dfs1(x), sz[now] += sz[x];
            }
        };
        function<void(int)> dfs2 = [&](int now) {
            int max_sz = sz[root] - sz[now];
            for (auto [x, ban_id] : adj[now]) {
                if (is_ban[ban_id] or x == par[now]) continue;
                chmax(max_sz, sz[x]), dfs2(x);
            }
            if (2 * max_sz <= sz[root]) centroid = now;
            // debug(now, max_sz);
        };
        dfs1(root), dfs2(root);
        // assert(centroid != -1);
        return centroid;
    };
    
    int root = 0;
    while (true) {
        int centroid = get_centroid(root);
        vector<pii> neigh;
        for (auto &[x, ban_id] : adj[centroid]) { if (not is_ban[ban_id]) neigh.eb(x, ban_id); }
        sort(ALL(neigh), [&](const pii &p1, const pii &p2) {
            int sz1 = (p1.first == par[centroid] ? sz[root] - sz[centroid] : sz[p1.first]);
            int sz2 = (p2.first == par[centroid] ? sz[root] - sz[centroid] : sz[p2.first]);
            return sz1 > sz2;
        });
        // debug(centroid, neigh);
        if (SZ(neigh) == 0) break;
        if (SZ(neigh) == 1) {
            print("?", root+1, neigh[0].first+1), cout << flush;
            int ret; cin >> ret;
            // assert(ret == 0 or ret == 2);
            is_ban[neigh[0].second] = true;
            root = (ret == 2 ? neigh[0].first : centroid);
        }
        if (SZ(neigh) >= 2) {
            print("?", neigh[0].first+1, neigh[1].first+1), cout << flush;
            int ret; cin >> ret;
            // assert(ret == 0 or ret == 1 or ret == 2);
            is_ban[neigh[0].second] = is_ban[neigh[1].second] = true;
            root = (ret == 0 ? neigh[0].first : (ret == 2 ? neigh[1].first : centroid));
        }
    }
    print("!", root+1), cout << flush;
}

int32_t main() {
    // fastIO();
    
    int t = 1; cin >> t;
    for (int _ = 1; _ <= t; ++_) {
        // cout << "Case #" << _ << ": ";
        solve();
    }
    
    return 0;
}

#else

#ifdef local
#define _GLIBCXX_DEBUG 1
#endif
#pragma GCC optimize("Ofast", "unroll-loops")
#include <bits/stdc++.h>
using namespace std;
// #include <bits/extc++.h>
// #include <tr2/dynamic_bitset>

using i64 = long long;
using i128 = __int128;
#define int i64
using f80 = long double;
using f128 = __float128;
#define double f80
using pii = pair<int, int>;
template <typename T> using Prior = std::priority_queue<T>;
template <typename T> using prior = std::priority_queue<T, vector<T>, greater<T>>;

// #define X first
// #define Y second
#define eb emplace_back
#define ef emplace_front
#define ee emplace
#define pb pop_back
#define pf pop_front
#define ALL(x) begin(x), end(x)
#define RALL(x) rbegin(x), rend(x)
#define SZ(x) ((int)(x).size())

// template <size_t D, typename T> struct Vec : vector<Vec<D-1, T>> {
//     static_assert(D >= 1, "Vector dimension must be greater than zero!");
//     template <typename... Args> Vec(int n = 0, Args... args) : vector<Vec<D-1, T>>(n, Vec<D-1, T>(args...)) {}
// };

// template <typename T> struct Vec<1, T> : vector<T> {
//     Vec(int n = 0, const T& val = T()) : vector<T>(n, val) {}
// };

template <typename T, typename U> istream& operator >> (istream &is, pair<T, U> &p)
{ return is >> p.first >> p.second; }

template <typename T, typename U> ostream& operator << (ostream &os, const pair<T, U> &p)
{ return os << p.first << " " << p.second; }

template <typename T> istream& operator >> (istream &is, vector<T> &vec)
{ for (size_t i = 0; i < size(vec); ++i) is >> vec[i]; return is; }

template <typename T> ostream& operator << (ostream &os, const vector<T> &vec)
{ for (size_t i = 0; i < size(vec); ++i) { if (i) os << " "; os << vec[i]; } return os; }

#ifdef local
#define fastIO() void()
#define debug(...) \
    _color.emplace_back("\u001b[31m"), \
    fprintf(stderr, "%sAt [%s], line %d: (%s) = ", _color.back().c_str(), __FUNCTION__, __LINE__, #__VA_ARGS__), \
    _do(__VA_ARGS__), _color.pop_back(), \
    fprintf(stderr, "%s", _color.back().c_str())
#define print(...) \
    fprintf(stdout, "%s", "\u001b[36m"), \
    _P(__VA_ARGS__), \
    fprintf(stdout, "%s", "\u001b[0m")

deque<string> _color{"\u001b[0m"};

template <typename T> concept is_string = is_same_v<T, string&> or is_same_v<T, const string&>;
template <typename T> concept is_iterable = requires (T _t) { begin(_t); };

template <typename T> inline void _print_err(T &&_t);
template <typename T> inline void _print_err(T &&_t) requires is_iterable<T> and (not is_string<T>);
template <size_t I, typename ...U> inline typename enable_if<I == sizeof...(U), void>::type _print_err(const tuple<U...> &);
template <size_t I, typename ...U> inline typename enable_if<I <  sizeof...(U), void>::type _print_err(const tuple<U...> &_t);
template <size_t I, typename ...U> inline typename enable_if<I == sizeof...(U), void>::type _print_err(tuple<U...> &);
template <size_t I, typename ...U> inline typename enable_if<I <  sizeof...(U), void>::type _print_err(tuple<U...> &_t);

inline void _do() { cerr << "\n"; }
template <typename T> inline void _do(T &&_t) { _print_err(_t), cerr << "\n"; }
template <typename T, typename ...U> inline void _do(T &&_t, U &&..._u) { _print_err(_t), cerr << ", ", _do(_u...); }
#else
#define fastIO() cin.tie(0)->sync_with_stdio(0)
#define debug(...) void()
#define print(...) _P(__VA_ARGS__)
#endif

inline void _P() { cout << "\n"; }
template <typename T> inline void _P(T &&_t) { cout << _t << "\n"; }
template <typename T, typename ...U> inline void _P(T &&_t, U &&..._u) { cout << _t << " ", _P(_u...); }

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

inline int getRand(int L, int R) {
    if (L > R) swap(L, R);
    return (int)(rng() % ((uint64_t)R - L + 1) + L);
}

template <typename T, typename U> bool chmin(T &lhs, U rhs) { return lhs > rhs ? lhs = rhs, 1 : 0; }
template <typename T, typename U> bool chmax(T &lhs, U rhs) { return lhs < rhs ? lhs = rhs, 1 : 0; }

/// below are Fast I/O and _print_err templates ///

/*
/// Fast I/O by FHVirus ///
/// https://fhvirus.github.io/blog/2020/fhvirus-io/ ///

#include <unistd.h>

const int S = 65536;

int OP = 0;
char OB[S];

inline char RC() {
    static char buf[S], *p = buf, *q = buf;
    return p == q and (q = (p = buf) + read(0, buf, S)) == buf ? -1 : *p++;
}

inline int RI() {
    static char c;
    int a;
    while (((c = RC()) < '0' or c > '9') and c != '-' and c != -1);
    if (c == '-') {
        a = 0;
        while ((c = RC()) >= '0' and c <= '9') a *= 10, a -= c ^ '0';
    }
    else {
        a = c ^ '0';
        while ((c = RC()) >= '0' and c <= '9') a *= 10, a += c ^ '0';
    }
    return a;
}

inline void WI(int n, char c = '\n') {
    static char buf[20], p;
    if (n == 0) OB[OP++] = '0';
    p = 0;
    if (n < 0) {
        OB[OP++] = '-';
        while (n) buf[p++] = '0' - (n % 10), n /= 10;
    }
    else {
        while (n) buf[p++] = '0' + (n % 10), n /= 10;
    }
    for (--p; p >= 0; --p) OB[OP++] = buf[p];
    OB[OP++] = c;
    if (OP > S-20) write(1, OB, OP), OP = 0;
}

/// Fast I/O by FHVirus ///
/// https://fhvirus.github.io/blog/2020/fhvirus-io/ ///
*/

#ifdef local

template <typename T> inline void _print_err(T &&_t) { cerr << _t; }

template <typename T> inline void _print_err(T &&_t) requires is_iterable<T> and (not is_string<T>) {
    _color.emplace_back(_color.back()), ++_color.back()[3];
    cerr << _color.back() << "[";
    for (bool _first = true; auto &_x : _t) {
        if (!_first) cerr << ", ";
        _print_err(_x), _first = false;
    }
    cerr << "]" << (_color.pop_back(), _color.back());
}

template <size_t I = 0, typename ...U> inline typename enable_if<I == sizeof...(U), void>::type _print_err(const tuple<U...> &) {
    cerr << ")" << (_color.pop_back(), _color.back());
}

template <size_t I = 0, typename ...U> inline typename enable_if<I <  sizeof...(U), void>::type _print_err(const tuple<U...> &_t) {
    if (!I) {
        _color.emplace_back(_color.back()), ++_color.back()[3];
        cerr << _color.back();
    }
    cerr << (I ? ", " : "("), _print_err(get<I>(_t)), _print_err<I+1, U...>(_t);
}

template <size_t I = 0, typename ...U> inline typename enable_if<I == sizeof...(U), void>::type _print_err(tuple<U...> &) {
    cerr << ")" << (_color.pop_back(), _color.back());
}

template <size_t I = 0, typename ...U> inline typename enable_if<I <  sizeof...(U), void>::type _print_err(tuple<U...> &_t) {
    if (!I) {
        _color.emplace_back(_color.back()), ++_color.back()[3];
        cerr << _color.back();
    }
    cerr << (I ? ", " : "("), _print_err(get<I>(_t)), _print_err<I+1, U...>(_t);
}

#endif

#endif

/**
 *                                                                                                                 
 *                                                                                                                 
 *                                                                                                                 
 *                            iiiiii         iiiiiiiiii       iiiiiiiiiiiiii                                       
 *                       iiiiiiiiiiiii   iiiiiii    iiii    iiiiiiiiiiiiiii                          ii   iiii     
 *                    iiiiiiii     iiiiiiiii         iiii       iiii iii              iii          iiiiiiiiii      
 *                 iiiiiii          iiiiii           iiii    iiii   ii           iiiiiiiiii      iiii iiii         
 *               iiiiii            iiiii             iiii iiii        iii      iiii    iiiiiiiiiiiiiiiii  ii       
 *             iiiiii            iiiiiii            iiiiiii       iiiiiiii   iii    iiiiiiiiiiiiii iii  iiii       
 *           iiiiii             iiiiiii            iiiii   ii   iiii       iiiiiiiiiii iiii  iii iiii iiii      iii
 *          iiiii              iiiiiiii       ii        iiiii iiii    iiiiiiiii        iii iii  iii  iii  ii  iiii 
 *        iiiiii              iiiiiiii      iiiii     iiiii iiiiiiiiiiiiiiii         iii  iii  ii  iii  iii iiii   
 *       iiiii                 iiiiii     iiii     iiiiii iiiiiii    iii iii       iiii  ii   i   ii  iii  iii     
 *     iiiiii                            iiii  iiiiiiiiiiiiiii       iii iiii   iiiii  iii  ii  iii  iii  ii       
 *    iiiii                              iiiiiiii iiiiiiiiii       iiii   iiiiiiiii            ii  iii  ii         
 *   iiiii                                     iiiiii  iiii      iiiii              iii      ii   ii  i            
 * iiiiii                                  iiiiiiii   iiiii    iiiii                        ii  ii   ii            
 * iiiii                                iiii  iiii    iiiiiiiiiiii                             ii                  
 *  iii                              iiii   iiii       iiiiiiii                                                    
 *                                iiiii   iiii                                                                     
 *                              iiii     iiii                                                                      
 *                            iiii    iiiii                                                                        
 *                          iii     iiiii                                                                          
 *                        iii     iiiii                                                                            
 *                       iii   iiiiii                                                                              
 *                       iiiiiiiii                                                                                 
 *                       iiiiii                                                                                    
 *                                                                                                                 
 *                                                                                                                 
 *                                                                                                                 
**/