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);}