下列虚基类的声明中,正确的是( )。A.class virtualB:public AB.virtual classB:public AC.class B:public A virtualD.class B:virtual public A

下列虚基类的声明中,正确的是( )。

A.class virtualB:public A

B.virtual classB:public A

C.class B:public A virtual

D.class B:virtual public A


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