问题描述：
No sooner （ ）asleep than she heard a knock at the window
A she had fallen
B had she fallen
Cshe fell
D did she fall
选什么 为什么选那个 请具体说明
A she had fallen
B had she fallen
Cshe fell
D did she fall
选什么 为什么选那个 请具体说明
问题解答：
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