Question

I ________ while reading the English Textbook. Luckily，my roommate worked me up in time!

A. had fallen asleep
B. have fallen asleep
C. fell asleep
D. fall asleep

Answer 1

答案C
该题考查动词时态.while用作连接词表示时间关系时，意思是“当……的时候”，主句中的动作或事情在从句中的动作或事情的进展过程中发生，从句若用过去进行时，主句应用一般过去时，答案为C.例如：Please don't talk so loud while others are working.别人在工作时，请勿大声讲话.
While I was reading the newspaper in the room，Tom came in.汤姆进来时，我正在房间里读报纸.
While she was doing that，I found two more boxes．
在她这样做时我又发现了两个盒子.
Margaret went off to take a shower while I continued cooking dinner．
我继续做饭时玛嘉丽特冲了一个澡.