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

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】试题分析：根据语境可知此句的含义是这个小男孩沿着街道走的时候，ufo正在着陆。此题重点考查的是while引导的状语从句表示当…的时候。其强调的是两个动作同时进行，并且经常用进行时态，故选C。考点：过去进行时的用法。

考点分析：

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