单项选择题

为完成下面的程序,应在划线处填入的语句是 #include<iostream> using namespace std; class Base { private: int x; public: Base(int i) { x=i; } ~Base(){} }; class Derived:public Base { public: ______ //完成类Derive构造函数的定义 }; int main() { Derived obj; return 0; }

A. Derived(int i):Base(i){}
B. Derived(){}
C. Void Derived (int i):Base(i){}
D. Denved(int i){Base(i);}