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    34．――When for Beijing?――On Sunday．They are now busy preparing for their trip．A．did they leave B．have they leftC．were they leaving D．are they leaving 【查看更多】

     

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    ——When         for Beijing?

    ——On Sunday．They are now busy preparing for their trip．

    A．did they leave                                             B．have they left

    C．were they leaving                                        D．are they leaving

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