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(jìn)行時(shí)，主句用過去時(shí)，表示在某個(gè)動(dòng)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(shí)睡著了。幸虧我的室友及時(shí)叫醒了我”。
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