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— You look scared. What happened?
— Well , I _______ along the street ________ the UFO landed.
A.was walking ; whileB.is walking ; when
C.was walking ; whenD.is walking ; while
C
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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