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

A.canB.mustC.can'tD.mustn't

【答案】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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