题目内容：

[单选题]下面程序的结果是includeclass A{public:A( ){cout<<"construtA"<

下面程序的结果是 #include＜iostream.h＞ class A { public： A( ) {cout＜＜"construtA"＜＜endl；} virtual~A( ) {cout＜＜"destructA"＜＜endl；}}； class B：public A {}； class C：public A {}； c

A．constructA destructA

B．constructA constructA destructA destructA

C．constructA constructA constructA destructA destructA destructA

D．constructA onstructA constructA constructA destructA destructA destructA destructA