our teacher---be in his office because the lights off.A can'

问题描述:

our teacher___be in his office because the lights off.A can't B.mustn't
选哪个?为什么?
1个回答 分类:英语 2014-11-23

问题解答:

我来补答
A.
can't表示否定的推测,意思是“不可能……”
mustn't意思是禁止,不允许
 
 
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