3、——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

3、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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