She had no sooner sat down________someone started knocking at the door.

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问题 She had no sooner sat down________someone started knocking at the door.

选项 A、when
B、after
C、than
D、while

答案C

解析 本题考查no sooner…than…的用法。no sooner…than…是固定结构,意为“一……就……”。该结构若置于句首,则主句使用倒装结构,hardly/scarcely…when…也是同样用法。根据句意和句型结构,确定本题答案为C)。when、after和while都可引导时间状语从句,但都不能与no sooner搭配,不符合句子结构要求,均可以排除。
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