英语选择题（情态动词）——Look ,the light in the teacher's office is still on .Mr.Brown is working there .He always works late at night.—— It ___be Mr.Brown .He's gone to Hawaii on vacation.A.can't B.mustn't C.may D.must ,为什么?

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英语选择题（情态动词）
——Look ,the light in the teacher's office is still on .Mr.Brown is working there .He always works late at night.—— It ___be Mr.Brown .He's gone to Hawaii on vacation.
A.can't B.mustn't C.may D.must
,为什么?

A 因为后边的句子说明他已经去夏威夷度假了.所以肯定不是布朗先生.
must 只能表示肯定推测,否定推测肯定不应该是can't .因为mustn't 表示禁止.

表示不可能的时候用can't be 不能用mustn't be。must be用于肯定用法表示一定是can be用于肯定用法表示可能是

A 表否定是选A

选A，must表示肯定推测，否定推测肯定不应该是can not。must not表示禁止。

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