#include<set>
#include<map>
#include<vector>
#include<queue>
#include<cmath>
#include<stack>
#include<bitset>
#include<iomanip>
#include<iostream>
#include<algorithm>
//#pragma GCC optimize("O0")
using namespace std;
#define int long long
#define double long double
const int maxn=3e5+10;
int arr[maxn]={0};
int sum[maxn]={0};
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
	int N;cin>>N;
	while(N--){
	int n;cin>>n;int x;int a;
	for(a=1;a<n;a+=2){
	cout<<"? "<<a<<" "<<a+1<<endl;
	cin>>x;
	cout.flush();
	if(x)break;
	}if(a==n){cout<<"? "<<n-1<<" "<<n<<endl;cout.flush();cin>>x;
	if(x==0){cout<<"! 1"<<endl;continue;}
	int t1=-1,t2=-1;cout<<"? 1 "<<n<<endl;cout.flush();cin>>t1;
	cout<<"? 2 "<<n<<endl;cout.flush();cin>>t2;
	if(t1&&t2)cout<<"! 2"<<endl;
	else cout<<"! 1"<<endl;
	continue;}
	if(a==n+1){cout<<"! 1"<<endl;
	continue;}
	int x1=-1,x2=-1;int x3=-1,x4=-1;
	for(int b=1;b<n;b++){
	if(b==a||b==a-1)continue;
	cout<<"? "<<b<<" "<<a+1<<endl;	cout.flush();
	cin>>x1;
	cout<<"? "<<b<<" "<<a<<endl;	cout.flush();
	cin>>x2;
	if(x1^x2){cout<<"! 2"<<endl;continue;}
	for(int c=b;c<=n;c++){
	if(c==a||c==a+1){continue;}
	if(x1)cout<<"? "<<c<<" "<<a+1<<endl;
	else cout<<"? "<<c<<" "<<a<<endl;
	cout.flush();
	cin>>x3;
	if(x3)cout<<"! 2"<<endl;
	else cout<<"! 1"<<endl;
	break;}
	break;}}
	}