#include<cstdio>
#include<vector>
#include<queue>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<ctime>
#include<random>
#include<array>
#include<assert.h>
#define pb emplace_back
#define mp make_pair
#define fi first
#define se second
#define dbg(x) cerr<<"In Line "<< __LINE__<<" the "<<#x<<" = "<<x<<'\n'
#define dpi(x,y) cerr<<"In Line "<<__LINE__<<" the "<<#x<<" = "<<x<<" ; "<<"the "<<#y<<" = "<<y<<'\n'
#define DE(fmt,...) fprintf(stderr, "Line %d : " fmt "\n",__LINE__,##__VA_ARGS__)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int>pii;
typedef pair<ll,int>pli;
typedef pair<ll,ll>pll;
typedef pair<int,ll>pil;
typedef vector<int>vi;
typedef vector<ll>vll;
typedef vector<pii>vpii;
typedef vector<pll>vpll;
template<typename T>T cmax(T &x, T y){return x=x>y?x:y;}
template<typename T>T cmin(T &x, T y){return x=x<y?x:y;}
template<typename T>
T &read(T &r){
	r=0;bool w=0;char ch=getchar();
	while(ch<'0'||ch>'9')w=ch=='-'?1:0,ch=getchar();
	while(ch>='0'&&ch<='9')r=r*10+(ch^48),ch=getchar();
	return r=w?-r:r;
}
template<typename T1,typename... T2>
void read(T1 &x,T2& ...y){read(x);read(y...);}
#define flh fflush(stdout)
int n;
int qry(int x,int y){
	printf("? %d %d\n",x,y);flh;
	int o;read(o);
	return o;
}
void solve(){
	read(n);
	int x=0,y=0;
	for(int i=1;i+1<=n;i+=2){
		if(qry(i,i+1)){
			x=i,y=i+1;
		}
	}
	if(n&1){
		if(qry(n-1,n))
			x=n-1,y=n;
	}
	if(!x){
		puts("! 1");
		flh;
		return ;
	}
	int z1=0,z2=0;
	for(int i=1;i<=n;i++)if(x!=i&&y!=i){
		if(!z1)z1=i;
		else{
			z2=i;
			break;
		}
	}
	int op=1;
	if(qry(x,z1)){
		if(qry(x,z2))op=2;
	}
	else if(qry(y,z1)){
		if(qry(y,z2))op=2;
	}
	cout<<"! "<<op<<'\n';
	flh;
}
signed main(){
	#ifdef do_while_true
//		assert(freopen("data.in","r",stdin));
//		assert(freopen("data.out","w",stdout));
	#endif
	int T;read(T);
	while(T--)solve();
    #ifdef do_while_true
//		cerr<<'\n'<<"Time:"<<1.0*clock()/CLOCKS_PER_SEC*1000<<" ms"<<'\n';
	#endif
	return 0;
}