单选题

class A { &nbsp &nbsp public: &nb...

Question

class A {
     public:
         virtual void Foo() = 0
         virtual void Print() { printf("A\n") }
 }
 class B: public A{
     public:
         void Foo() override { printf("FOO\n") }
         void Print() override { printf("B\n") }
 }
 int main() {
     A* ptr1 = new A
     A* ptr2 = new B
     ptr1->Print()
     ptr2->Print()
     return 0
 }

A. A,B

B. A,A

C. B,B

D. 编译报错，无法执行