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

解析試題分析：A. mustn’t禁止，B. needn’t不必，C. can’t不能，D. may not可能不，句意：湯姆不可能生病了，因為我看見他一小時前在打籃球。Can’t be是否定推測，表示“不可能”，選C。
考點：考查情態(tài)動詞

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