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

A．can; can

B．can’t ; must

C．can’t; can

D．must ; can

解析試題分析：以can引導的一般疑問的簡略回答要用can，肯定性回答要用yes…can；否定性回答要用no，…can’t.can表示的是一種能力，意思是可以，能夠等；而must表示必須，強調責任或義務或命令。根據語境的含義可知選擇B。
考點：情態動詞can和must的區別。
點評：情態動詞是一種本身有一定的詞義，但要與動詞原形及其被動語態一起使用，給謂語動詞增添情態色彩，表示說話人對有關行為或事物的態度和看法，認為其可能、應該或必要等。情態動詞后面加動詞原形。

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