class class1

{

Public virtual void test(){}

}

Class class2: class1

{

Public overrice void test()

{

Console.Write(“class2”);

}

}

Class class3: class2

{

Public override void test()

{

Console.Write(“class3”);

}

}

则下列语句的输出是什么?()

Class2 x = new class3(); x.test();

A.class3 class2

B.class3

C.class2 class3

D.class2