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【题目】—Look! It ________ be David in the classroom.

—It ________ be him. Because I saw him in the library a moment ago.

A.may; mustn’tB.must; can’tC.can; can’tD.can; mustn’t

【答案】B

【解析】

句意:——看,大卫一定在教室里面。——一定不是他。因为我刚才在图书馆见过他。

may可能;mustn’t禁止;must必须;can’t不能,一定不是;can能,会;根据上文Look!可知下文是有把握的肯定推测用must。根据下文Because I saw him in the library a moment ago.可知,第二空是没把握的否定推测,用can’t。根据题意,故选B

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