— 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
此題重點考查when和while引導(dǎo)的時間狀語從句的基本區(qū)別。When引導(dǎo)的時間狀語從句常用一般時態(tài)，有時也用進行時態(tài)；while引導(dǎo)的時間狀語從句常用進行時態(tài)。
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