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---Can I watch TV now? 
---No, you         .You________ do your homework first.

A.can; canB.can’t ; mustC.can’t; canD.must ; can

B

解析试题分析:以can引导的一般疑问的简略回答要用can,肯定性回答要用yes…can;否定性回答要用no,…can’t.can表示的是一种能力,意思是可以,能够等;而must表示必须,强调责任或义务或命令。根据语境的含义可知选择B。
考点:情态动词can和must的区别。
点评:情态动词是一种本身有一定的词义,但要与动词原形及其被动语态一起使用,给谓语动词增添情态色彩,表示说话人对有关行为或事物的态度和看法,认为其可能、应该或必要等。情态动词后面加动词原形。

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