—I would like to pick up your sister for you. But I don’t know her. _____?

—A middle-aged woman with a round face, wearing a red blouse.

A．How about your sister

B．What do you think of your sister

C．What is your sister like

D．What does your sister do

有如下程序：
#include＜iostream＞
using namespace std;
class XX

protected:
int k;
public:
XX(int n=5):k(n);
～XX()

cout＜＜"XX":

virtual void f()const=0;
;
inline void XX::f()const

cout＜＜k+3;
;
class YY:public XX

public:
～YY()

cout＜＜”YY”;

void f()const

cout＜＜k-3; XX::f();

;
int main()

XX &p=*new YY;
P.f();
delete &p;
return 0:

执行上面的程序将输出( )。

A．28XX

B．28YYXX

C．33XX

D．33XXYY