——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
科目：初中英語 來源： 題型：
——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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