18． My mother for Beijing in a few days. I wonder when the earliest plane on Monday?A. l

问题补充：

18． My mother for Beijing in a few days. I wonder when the earliest plane on Monday?

A. leaves; takes off

B. is leaving; takes off

C. is leaving; is taking off

D. leaves; is taking off

答案：

A. leaves; takes off

(答案→)B. is leaving; takes off

C. is leaving; is taking off

D. leaves; is taking off

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