有如下程序: #include<iostream> using namespace std; class Base {public: void fun() { cout<<"Base::fun"<<endl; } }; class Derived: public Base { public:void tim()} ____________ cout<<"Derived:: fun"<<endl;} }; int main() {Derived d;d.fun();return O; } 已知其执行后的输出结果为: Base::fun Derived::fun 则程序中下划线处应填入的语句是
A.Basfun();
B.Base::fun();
C.Base->fun();
D.fun();