题目内容

---Can I watch TV now? 
---No, you         .You________ do your homework first.
A．can; canB．can’t ; mustC．can’t; canD．must ; can
B

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。
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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