问题补充:
—Listen!Helen is singing in the next room.
—It be Helen .She has gone to Beijing.
A. should
B. mustn’t
C. may
D. can’t
答案:
A. should
B. mustn’t
C. may
(答案→)D. can’t
解析:A. should 应该 B. mustn’t 禁止 C. may可能 D. can’t不可能;句意:听!海伦正在隔壁房间唱歌。不可能是海伦,她已经去北京了。故选D