classParent(object):x=1classChild1(Parent):passclassChild2(Parent):passprint(Parent.x,Child1.x,Child2.x)Child1.x=2print(Parent.x,Child1.x,Child2.x)Parent.x=3print(Parent.x,Child1.x,Child2.x)输出结果是: A. 1 1 1 1 2 1 1 1 1 B. 1 1 1 1 1 1 1 1 1 C. 1 1 1 1 2 1 3 2 3 D. 3 2 3 3 2 3 3 2 3