【单选题】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()...
【单选题】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 Hell...