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Unless I finish all my homework, I _____...

Unless I finish all my homework, I _____________watch TV or go out with my friends.

A.can B.must C.can't D.mustn't

 

C 【解析】 句意:除非我完成所有的作业,否则我不能看电视或者和我的朋友出去。 考查情态动词词义辨析。can可以;能;must必须;can't不能;mustn't禁止。根据句意可知此处表示写不完作业不能看电视,也不能出去玩,故选C。 情态动词 用法 can 表示能力,意为“能;会”,可与be able to转换。否定式 can't 表示请求、允许,意为“可以” could can的过去式,意为“能;会”,表示过去的能力 在疑问句中表示委婉的请求 couldn't 表示“不能;不会” must 表示主观看法,意为“必须;应该” 否定式mustn't,表示“禁止;不允许” have to 不得不,表示客观原因。否定式 don't have to should 意为“应该”,表示要求和命令,也可以表示劝告或建议 may 表示请求、许可,意为“可以”,还可表示祝福和愿望 might may的过去式 表示请求、许可,语气比may更委婉 need 表示需要,主要用于否定句和疑问句中 shouldn't should的否定式,表示“不应该” needn't need的否定式,表示“不必;无需”  
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