-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

試題分析：句意：現(xiàn)在我可以看電視嗎，媽媽？不，你不能。你必須先做你的家庭作業(yè)。對(duì)may開(kāi)頭的問(wèn)句回答，否定形式常用can’t。所以選C。
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