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    -Mum, may I go out to play? -No, you . You must finish your homework first. A. may not B. mustn’t C. couldn’t D. needn’t 【查看更多】

     

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    —Mum, may I go out to play?

    —No, you _____. You must finish your homework first.

    A. may not　　　 B. mustn’t　　　 C. couldn’t　　　 D. needn’t

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