While the boy ______ down the street, th...

While the boy ______ down the street, the UFO _____ .

A．was walking; was landing

B．walked; landed

C．was walking; landed

D．walked; was landing

C 【解析】本题是考查while 引导的从句，其中主句为短暂性动词，从句为延续性动词，且主句的动作发生在从句的动作中，故选C

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