No sooner______asleep than she heard a knock at the door.A、had she fallenB、she

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问题 No sooner______asleep than she heard a knock at the door.

选项 A、had she fallen
B、she had fallen
C、did she fall
D、she fell

答案 A

解析本题考查部分倒装句的用法。No sooner…than解释为“一……就……”，从句部分要部分倒装，即“had+主语+done”，因此选择A。与其用法相似的结构还有hardly…when。如：Hardly had he arrive home when it began to rain．

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