下列虚基类的声明中,正确的是( )。
(A)class virtual B:public A
(B)virtual class B:public A
(C)class B:public A virtual
(D)class B: virtual public A
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(A)class virtual B:public A
(B)virtual class B:public A
(C)class B:public A virtual
(D)class B: virtual public A