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  3. No sooner _______ asleep than she heard a knock at the door. ( )

No sooner _______ asleep than she heard a knock at the door. ( )

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问题 No sooner _______ asleep than she heard a knock at the door. (    )
选项 A、she had fallen
B、had she fallen
C、she had fell
D、had she fell
答案B
解析 No sooner…than…意为“一……就……”，是一个固定用法，引导时问状语从句，主句用过去完成时，than后面的从句用一般过去时；具有否定意义的no sooner放句首时，主句要倒装，即助动词提到主语前面。答案为B。
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