I——while reading the English textbook .luckily ,my classmate woke me up in time .为什么横线上填fell asleep had fallen asleep 为什么是错误的?

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I——while reading the English textbook .luckily ,my classmate woke me up in time .为什么横线上填fell asleep had fallen asleep 为什么是错误的?
I——while reading the English textbook .luckily ,my classmate woke me up in time .
为什么横线上填fell asleep
had fallen asleep 为什么是错误的?

I——while reading the English textbook .luckily ,my classmate woke me up in time .为什么横线上填fell asleep had fallen asleep 为什么是错误的?
首先,句子意思为“我读着英语课本的时候睡着了.幸好,我的同桌及时叫醒了我.”
从后面看这两个句子,第二句话“幸好,我同桌及时叫醒了我.”很好理解,更重要的是你看一下叫醒的动作,用的是一般过去时,还有一个时间状语,“及时”.
再来看第一个句子.这个句子实际上是带有一个while引导的时间状语.
第一个句子又可以分为两层含义：
I fell asleep.我睡着了.
While reading the English textbook.在读英语课本的时候.
你有没有注意到,如果没有while引导的这个句子,I fell asleep.这个句子也是主语谓语宾语很齐全,是一个完整的句子?所以,为了和表示同时进行的（in time的含义）下的“wake up",表示动作的一致性,就要用一般过去时.
从另一个角度讲,这个题目考察的是一般过去时与过去完成时的区别.一般过去时纯表示动作是在过去发生的.而过去完成时表示动作中过去发生并且产生了影响.你看这道题目中并没有产生影响,说话者只是在单单陈述睡着的这件事.

while 在....期间

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