We finished the job last night but it was already midnight I arrived homeA. whileB. when

问题补充：

We finished the job last night ,but it was already midnight I arrived home．

A. while

B. when

C. where

D. that

答案：

A. while

(答案→)B. when

C. where

D. that

解析：句意：我们昨晚完成了这项工作，但是当我到家的时候，已经是午夜了。这里含有一个时间状语从句，when当……时候，选B。