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

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

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

_____Listen!Helen is singing in the next room.___It ____be Helen.She has gone to Beijing.A.can'tB.mustn't
海伦去北京了.不可能是她.
-----说话者对此很确定.所以用B

A

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

选A
can't 表示不可能
mustn't 表示不许