They had no sooner arrived at the bus station than the bus .A. had leftB. will leaveC. le

问题补充：

They had no sooner arrived at the bus station than the bus .

A. had left

B. will leave

C. left

D. is leaving

答案：

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。