They had no sooner arrived at the bus station than the bus .
A. had left
B. will leave
C. left
D. is leaving
网友回答
A. had left
B. will leave
(答案→)C. left
D. is leaving
解析：考查时态：句意：他们一到车站公共汽车就离开了。表示 “一……就”的几个句型：Hardly / No sooner / Scarcely had + 过去分词 + when / than + 一般过去时。所以选C。