阅读以下代码，输出结果为（）
class A
{
public:
virtual void a()=0;
virtual ~A(){}
};
class AA:public A
{
public:
void a()
{
cout
A nihao2 nihao3 delete AA delete AAA delete B
B nihao3 nihao3 delete AAA delete AA delete B
C nihao2 nihao2 delete AAA delete AA delete B
D nihao2 nihao3 delete AAA delete AA delete B
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