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(inti):Base(i)
B.Derived()
C.voidDerived(inti):Base(0)
D.Derived(inti)Base(i);