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He was just falling asleep _____ there was a loud knock on the door.
A.whileB.whenC.thenD.until
B

试题分析:句意:在他刚刚睡着的时候,有人在大声地敲门。be doing sth …when …正在做某事的时候,突然…,固定句型,此处的when表示“突然”,故选B
点评:连词在中考中涉及到的很多,尤其在宾语从句、状语从句、定语从句中连词是必考点。平时学习过程中,掌握连词的意思,及所表示的关系是至关重要的,这种关系的判断可以通过句子意思的理解来选择恰到的连词。while表示当…时候,强调两个动作同时进行,多用于进行时态中,只与延续性的动词连用,then然后,until表示直到...,常与not连用。
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