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-May I watch TV now, Mum?
-No, you_______. You_______ do your homework first.
A. don't; must     B. don't; can't    C: can't, must     D. can't; can
C

试题分析:句意:现在我可以看电视吗,妈妈?不,你不能。你必须先做你的家庭作业。对may开头的问句回答,否定形式常用can’t。所以选C。
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