题目

下列各项制度符合西周情况的是     ①禅让制                    ②世袭制                    ③分封制                    ④等级制     A．①②③                B．②③④                C．①③④                   D．①②④ 答案：BShe devoted all her time and energy to ________ the little child.A. look after B. looking afterC. looked after D. looks after