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7.Tom ____ be ill,for I saw him playing basketball an hour ago.(  )
A.mustn'tB.needn'tC.can'tD.may not

分析 Tom不可能生病了,因为一小时前我看到他在打篮球.

解答 答案是C.本题考查情态动词辨析;mustn't禁止;needn't不必;can't不可能;may not也许不;根据下文"I saw him playing basketball an hour ago(我一小时前看到他在打篮球)"推断Tom"不可能"生病,所以答案选择C.

点评 要在正确理解情态动词的基本含义的基础上,整体理解语境中的情感态度,做出合理的判断.

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