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---Look at the boy running on the playground. Is it David?
---It ________ be him. I saw him go to the teachers’ office just now.

A.mustn’t B.can’t
C.couldn’t D.must

B

解析试题分析:句意:看看那个在操场上跑的男孩是大卫吗?那肯定不是他,刚才我看到他去了老师的办公室。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……。根据后文描述可知是否定猜测,故选B。
考点:考查情态动词的用法。

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