#include<bits/stdc++.h>
#define int long long 
using namespace std;
int n;
int ask(int x,int y){
    cout << "? " << x << " " << y << '\n';
    cout.flush();
    int t;
    cin >> t;
    return t;
}
void answer(int x){
    cout << "! " << x << '\n';
    cout.flush();
}
void check(int x,int y){
    vector<int> other;
    for(int i = 1; i <= n && other.size() < 2; ++i){
        if(i != x && i != y)
            other.emplace_back(i);
    }
    int a = ask(x,other[0]);
    int b = ask(y,other[1]);
    if(a && b)
        answer(1);
    else if(!a && !b)
        answer(1);
    else if(a && !b)
        answer(1 + ask(x,other[1]));
    else if(!a && b)
        answer(1 + ask(y,other[0]));
    return;
}
signed main()
{
#ifdef NICEGUODONG
    // freopen("data.in","r",stdin);
#endif
    int T;
    ios::sync_with_stdio(false);
    cin >> T;
    while(T--){
        int flag = 0;
        cin >> n;
        for(int i = 1; i + 1 <= n; i += 2){
            int x = i;
            int y = i + 1;
            if(ask(x,y)){
                check(x,y);
                flag = 1;
                break;
            }
        }
        if(flag) continue;
        if(n & 1){
            if(ask(1,n))
                check(1,n);
            else
                answer(1);
        }
        else
            answer(1);
    }
    return 0;
}