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--- Is Lucy knocking at the door?
--- No. It ______ be Lucy. She is in America now.

A.may not B.mustn’t
C.can’t D.shouldn’t

C

解析试题分析:句意:是露西在敲门吗?不是,肯定不是露西,她现在在美国。must,can(could),may(maight) 可以表示猜测,must 表示肯定猜测,用于肯定句,肯定……,一定……;can’t,表示否定猜测,肯定不……,另外can(could),may(maight),表示可能性猜测,可能···。根据后句她在美国,可知是否定猜测,故选C。
考点:考查情态动词的用法。

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