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：考查情態(tài)動詞。句意：湯姆不可能生病了，因為我一小時前還看到他在打籃球。情態(tài)動詞表允許，也可以表示推測。表推測時，must意為“一定”，表示肯定推測，否定推測不能用mustn’t，mustn’t意為“禁止”；否定推測用can’t“不可能”，may not意為“可能不”。故選C。

考點：考查情態(tài)動詞

 

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