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—MayIwatchTVforawhile,Mum? —Yes,butyou       finishyour...

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—MayIwatchTVforawhile,Mum? —Yes,butyou       finishyour...

—May I watch TV for a while, Mum?

  —Yes, but you        finish your homework first.

  A. may                            B. must                        C. need                        D. can

【回答】

B

知识点:情态动词

题型:选择题