---_______ I go out to play now, mum?
---No, you ________ You should do your homework first.A.Must; mustn'tB.Might; wouldn'tC.Need; mustn'tD.May; had better not
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D解析回答May ...?一般用No，you mustn't或No, you may not. 本题中的D项had better not也起告诫作用，回答Must I…?或Need I…?时，否定回答都用No，you needn't