#include <bits/stdc++.h>
using namespace std;

int query(int l, int r) {
    cout << "? " << l << ' ' << r << endl;
    int res;
    cin >> res;
    return res;
}

void solve() {
    int n;
    cin >> n;
    int l = 1, r = n;
    int k = query(1, n);
    while (r-l > 1) {
        if (r-l == 2) {
            int m = (l+r)/2;
            if (k > m) {
                if (k == query(m, r)) {
                    l = m;
                } else {
                    r = m-1;
                }
            } else {
                if (k == query(l, m)) {
                    r = m;
                } else {
                    l = m+1;
                }
            }
            break;
        }
        if (k < (l+r)/2) {
            int m = l + (r-l)/3*2;
            if (k == query(l, m)) r = m;
            else {
                l = m+1;
                if (l != r) k = query(l, r);
            }
        } else {
            int m = r - (r-l)/3*2;
            if (k == query(m, r)) l = m;
            else {
                r = m-1;
                if (l != r) k = query(l, r);
            }
        }
    }
    if (l == r) {
        cout << "! " << l << endl;
    } else {
        cout << "! " << (l == k ? r : l) << endl;
    }
}

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int t;
    cin >> t;
    for (; t; t--) solve();

    return 0;
}