54. 已知接口IHello 和类Base、MyClass 的定义如下
interface IHello {
void Hello();
}
class Base : IHello {
public void Hello()
{
System.Console.WriteLine("Hello in Base！");
}
}
class Derived : Base {
public void Hello()
{
System.Console.WriteLine("Hello in Derived！");
}
}
则下列语句在控制台中的输出结果为_____。
IHello x = new Derived();
x.Hello();
A. Hello in Base！
B. Hello in Derived！
C. Hello in Base！Hello in Derived！
D. Hello in Derived！Hello in Base！..
