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【题目】I saw Alan playing tennis in the gym a moment ago, so he_______ be ill today.

A. mustn’t B. can’t C. shouldn’t D. needn’t

【答案】B

【解析】句意:我刚才看见艾伦在健身房打网球,所以今天他不可能生病了。考查情态动词辨析题。A. mustn’t一定不,表禁止;B. can’t不可能,表示否定推测;C. shouldn’t不应该,用于劝告;D. needn’t不需,没有必要。本句是否定推测,根据句意语境,可知选B。

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