题目内容
有如下程序：#include ＜iostream＞using namespace std;class Base public: void fun() cout＜＜"Base:: fun"＜＜end1; ;class Derived: public Base ( public: void fun() ____________________________ cout＜＜"Derived:: fun"＜＜end1;;int main() Derived d; D. fun(); return O;已知其执行后的输出结果为：Base:: funDerived:: fun则程序中下划线处应填入的语句是( )。
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