【題目】Who’s that boy reading in the garden? Is it David?

----It______be David. I saw him in the classroom just now.

A. must B. can’t C. may D. shouldn’t

【答案】B

【解析】

試題分析：句意：在花園里讀書的那個男孩是誰？它是大衛(wèi)嗎？-它肯定不是大衛(wèi)。剛才我看到他在教室里。must,can(could),may(maight) 可以表示猜測，must 表示肯定猜測，用于肯定句，肯定······，一定······；can’t,表示否定猜測，肯定不······，另外can(could),may(maight)，表示可能性猜測，可能······。根據(jù)句意，可知是否定猜測，故選B。

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