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    【题目】All the gifts must be mailed immediately________in time for Christmas.

    A．in order to have received

    B．in order to receive

    C．so as to be received

    D．so as to be receiving

    【答案】C

    【解析】so as to后接动词原形，表示“以便”，根据gift与receive的关系可判断出要用to be done的形式；表示被动。

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