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I ________ while reading the English textbook. Luckily, my roommate woke me up in time!
A.had fallen asleepB.have fallen asleep
C.fell asleepD.fall asleep
C
while 从句用过去进行时,主句用过去时,表示在某个动作的持续过程中,发生过某事。句意为“我在读英语课本时睡着了。幸亏我的室友及时叫醒了我”。
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