___Listen!Helen is singing in the next room._It ____be Helen.She has gone to Beijing.A.can'tB.mustn't

分类: 作业答案 • 2021-12-19 16:17:39

问题描述：

_____Listen!Helen is singing in the next room.
___It ____be Helen.She has gone to Beijing.
A.can't
B.mustn't

答

选A
can't 表示不可能
mustn't 表示不许

答

A
can't 表示推测不可能
mustn't 不表示推测是不允许，不准的意思

答

海伦去北京了.不可能是她.
-----说话者对此很确定.所以用B

答

_____Listen!Helen is singing in the next room.___It ____be Helen.She has gone to Beijing.A.can'tB.mustn't