________ from endless homework on weekends, the students now find their own activities, such

as taking a ride together to watch the sunrise.[      ]

A. Freed      

B. Freeing

C. To free  

D. Having freed

若有以下程序：
#include＜iostream＞
using namespace std;
class A

public:
A(int i,int j)

a=i;
b=j;

void move(int x,int y)

a+=x;
b+=y;

void show()

cout＜＜a＜＜","＜＜b＜＜endl;

private:
int a,b;
;
class B:private A

public:
B(int i,int j):A(i,j)
void fun()

move(3,5);

void fl()

A::show();

;
int main()

B d(3,4);
d.fun();
d.fl();
return 0;

程序执行后的输出结果是( )。

A．3,4

B．6,8

C．6,9

D．4,3