— 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
此題重點(diǎn)考查when和while引導(dǎo)的時(shí)間狀語(yǔ)從句的基本區(qū)別。When引導(dǎo)的時(shí)間狀語(yǔ)從句常用一般時(shí)態(tài)，有時(shí)也用進(jìn)行時(shí)態(tài)；while引導(dǎo)的時(shí)間狀語(yǔ)從句常用進(jìn)行時(shí)態(tài)。
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