I had hardly sat down _______ he stepped in. - 题库学习平台

I had hardly sat down _______ he stepped in.
A、when
B、that
C、until
D、after
【正确答案】：A
【题目解析】：when引导时间状语从句，意为“当....时”。句意：我刚坐下他就进来了。

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