No sooner had they sat down ______ they found it was time to leave.

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问题 No sooner had they sat down ______ they found it was time to leave.

选项 A、when
B、then
C、as
D、than

答案D

解析 no sooner...than...是固定的格式,意思是“一……,就……”。具有类似意思的常见固定格式还有hardly...when...和scarcely...when...等。
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