As is required by their employer, the employees ______ finish the project within this month.

A．could

B．shall

C．may

D．should

下列程序中横线处正确的语句是( )。
#include＜iostream＞
using namespace std;
class TestClass

public:
　void fun()cout＜＜"TestClass::fun"＜＜end1;
;
class TestClass1:public TestClass

void fun()

______//显示调用基类的函数 fun()
cout＜＜"TestClass1::fun"＜＜end1;

；

A．fun();

B．TestClass.fun()

C．TestClass::fun()；

D．TestClass-＞fun()；