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  3. No sooner had we finished the conversation______we heard a knock on the door.

No sooner had we finished the conversation______we heard a knock on the door.

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问题 No sooner had we finished the conversation______we heard a knock on the door.
选项 A、when
B、then
C、than
D、until
答案C
解析 “no sooner…than…”是固定搭配，意为“刚一……就……”，主句一般用过去完成时，从句用一般过去时，例如：No sooner had he sat down than the doorbell rang．他刚一坐下，门铃就响了。when要和hardly，scarcely或barely连用，意思同“nosooner…than…”，例如：Hardly(Scarcely，Barely)had I closed my eyes when I began toimagine the most fantastic shapes．我刚一合眼，就开始想奇形怪状的东西。根据结构可知C为正确答案。
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考研英语一

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