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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 從句用過去進行時，主句用過去時，表示在某個動作的持續(xù)過程中，發(fā)生過某事。句意為“我在讀英語課本時睡著了。幸虧我的室友及時叫醒了我”。
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