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);