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I was about to fall asleep______there was a knock at the door.A、asB、whileC、the
I was about to fall asleep______there was a knock at the door.A、asB、whileC、the
游客
2023-11-03
5
管理
问题
I was about to fall asleep______there was a knock at the door.
选项
A、as
B、while
C、then
D、when
答案
D
解析
状语从句题。根据句意可知,本题需要选的是时间状语从句的引导词。when引导时间状语从句时,可以表示某一个动作正在进行或即将发生时突然出现的情况,意为“就在那时;突然”,所以选项[D]为答案。选项[A]和[B]也可以引导时间状语从句,均可表示“在……期间”,并且as还有“一边……一边……;随着”的意思,但两个选项都没有when的这种用法,故排除;选项[C]只是副词,不能连接两个句子,故排除。
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