【題目】--- Look! It _____ be John on the playground.

--- It_____ be him. I saw him in the classroom just now.

A. may, mustn’tB. must, can’t

C. can, can’tD. mustn’t, can

【答案】B

【解析】

句意：——看！在操場上的一定是約翰。——不可能是他。我剛才在教室里看見他了。may可能，表示推測時把握性不大，must一定是，用在肯定句中，表示有把握的推測；can’t不可能，用在否定句中表示有一定依據(jù)的推測。mustn’t沒有推測之意。結合語境“我剛才看見他在教室里”推測在操場上的不可能是湯姆，用can’t表推測，排除A,D；can“能夠，可以”，在肯定句中也無推測之意，故答案選B。

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