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He is a very careful man, but he ________ make mistakes which seem ridiculous
A.canB.must C.mayD.will
A

试题分析:句意:他是一个非常仔细的人,但是他有时候也会犯一些看起来非常荒唐的错误。can用于肯定句中表示一种理论上的可能性,并不牵涉是否真的会发生,在这种用法中can只能与动词原形连用,故选A.
点评:can, could表达推测时,一般用于疑问句和否定句中;can用于肯定句中表示一种理论上的可能性,并不牵涉是否真的会发生,在这种用法中can只能与动词原形连用;could用于肯定句中,语气比may/ might更弱。can表示理论上的可能性,翻译为:有时候会…
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