I ____while reading the English textbook ,Luckily ,my roomma

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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

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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再问：那为什么不能用fall asleep
再答：根据后面的my roommate woke me up in time可知是一般过去时（ woke 是wake 的过去式）

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