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Hardly ______asleep when someone knocked at the door.
A,she had fallen    B,she fell     C,had she fallen   D,did she fall
C

试题分析:when引导的时间状语从句,从句时一般过去时,主句要用过去完成时。又因为表示否定意义的词Hardly位于句首,故主句用部分倒装。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。所谓部分倒装就是把谓语动词的一部分,即助动词、情态动词、系动词移至主语的前面。因为前面有了助动词或情态动词,所以后边的动词要用原形。
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