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Tom ____ be ill, for I saw him playing basketball an hour ago. 
A.mustn’t B.needn’t C.can’t D.may not
C

试题分析:A. mustn’t禁止,B. needn’t不必,C. can’t不能,D. may not可能不,句意:汤姆不可能生病了,因为我看见他一小时前在打篮球。Can’t be是否定推测,表示“不可能”,选C。
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