题目内容
— You look scared. What happened?
— Well , I _______ along the street ________ the UFO landed.
A. was walking ; while B. is walking ; when
C. was walking ; when D. is walking ; while
【答案】
C
【解析】此题重点考查when和while引导的时间状语从句的基本区别。When引导的时间状语从句常用一般时态,有时也用进行时态;while引导的时间状语从句常用进行时态。
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