有如下程序：
#include ＜iostream＞
using namespace std;
class Test
public:
Test() n+=2;
～Test() n-=3;
static int getNum()retum n;
private:
static int n;
;
int Test:: n=1;
int main()

Test*p=new Test;
delete p;
cout＜＜"n="＜＜Test:: getNum()＜＜end1;
return 0;
;
执行后的输出结果是______.

A．n=0

B．n=1

C．n=2

D．n=3

I ___________ frustrated when I wasn’t sure of the correct answer.    [ ]

A. may be          

B. used to        

C. used to be        

D. use to be