WhileI      anovel,someone     atthedoor.  A.read,waskn...

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问题详情:

WhileI      anovel,someone     atthedoor.  A.read,waskn...

While I       a novel,someone      at the door.  


A.read,was knocking                B.read,knocked


C.was reading,knocked.        D.was reading,was knocking


【回答】

C

知识点:动词时态

题型:选择题

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