问题 选择题

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

A.was walking; was landing

B.walked; landed

C.was walking; landed

D.walked; was landing

答案

答案:C

考查时态:句意:当男孩正沿着街道走的时候,不明飞行物着陆了,while引导的时间状语从句经常用过去进行时态。主句用一般过去时,选C。

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