【題目】—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，大衛(wèi)一定在教室里面�！欢ú皇撬�。因為我剛才在圖書館見過他。

may可能；mustn’t禁止；must必須；can’t不能，一定不是；can能，會；根據(jù)上文Look!可知下文是有把握的肯定推測用must。根據(jù)下文Because I saw him in the library a moment ago.可知，第二空是沒把握的否定推測，用can’t。根據(jù)題意，故選B。

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