I ____while reading the English textbook ,Luckily ,my roommate woke me up in timea.had fallen asleep b.have fallen asleep c.fell asleep d.fall asleep 选什么

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I____whilereadingtheEnglishtextbook,Luckily,myroommatewokemeupintimea.hadfallenasleepb.havefallenasl

I ____while reading the English textbook ,Luckily ,my roommate woke me up in timea.had fallen asleep b.have fallen asleep c.fell asleep d.fall asleep 选什么
I ____while reading the English textbook ,Luckily ,my roommate woke me up in time
a.had fallen asleep b.have fallen asleep c.fell asleep d.fall asleep 选什么

I ____while reading the English textbook ,Luckily ,my roommate woke me up in timea.had fallen asleep b.have fallen asleep c.fell asleep d.fall asleep 选什么
C
while 引导的从句:当一个动词正在进行时,另一个动作发生了,根据句意用一般过去时
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C
句子是过去时态 排除BD
A是过去完成时 不合句意 故选C

c fell asleep