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。