I Beijing in a few days. Do you know when the earliest plane ?A. leaves; takes offB. am

问题补充：

I Beijing in a few days. Do you know when the earliest plane ?

A. leaves; takes off

B. am leaving; takes off

C. leave; is taking off

D. am leaving; is taking off

答案：

A. leaves; takes off

(答案→)B. am leaving; takes off

C. leave; is taking off

D. am leaving; is taking off

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