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    31．--Must we collect the waste paper and bottles now?-- ．You Call do it after class．A．Yes.you must B．No.you needn’t C．Yes.you may D．No.you mustn’t 【查看更多】

     

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    -Must we collect the waste paper and bottles now?

    -- __________．You Call do it after class．

    A．Yes，you must  B．No，you needn’t  C．Yes，you may  D．No，you mustn’t

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