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        1. ---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

          解析試題分析:句意:看看那個(gè)在操場(chǎng)上跑的男孩是大衛(wèi)嗎?那肯定不是他,剛才我看到他去了老師的辦公室。must,can(could),may(maight) 可以表示猜測(cè),must 表示肯定猜測(cè),用于肯定句,肯定……,一定……;can’t,表示否定猜測(cè),肯定不……,另外can(could),may(maight),表示可能性猜測(cè),可能……。根據(jù)后文描述可知是否定猜測(cè),故選B。
          考點(diǎn):考查情態(tài)動(dòng)詞的用法。

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