——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

1、D

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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．a(chǎn)re they leaving

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