下列程序的输出结果是 【10】 。
#include ＜iostream＞
using namespace std;
int main()

int i=5;
iht & r=i;r=7;
cout＜＜i＜＜end 1;
return 0;

______ he has made up his mind, no one can make him change it.

A．Once

B．Unless

C．Until

D．As