10．Hardly ________ when she ________ someone knocking at the door．（　　）
A．did she sit，heardB．did she sit，had heard
C．had she sat，had heardD．had she sat，heard

分析 她一坐下來，就聽到有人在敲門．

解答 答案：D  本句中hardly是否定詞，位于句首，主句需要部分倒裝，根據(jù)句意，主句動作發(fā)生在從句動作之前，所以用過去完成時，所以本題選擇D．

點評 表否定意義的否定詞或者短語位于句首，需要倒裝．

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