Question

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

A．was walking; was landing

B．walked; landed

C．was walking; landed

D．walked; was landing

Answer 1

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。