When I found Miss Lin in the office,she_____

问题描述:

When I found Miss Lin in the office,she_____
A.fell asleep B.would be falling asleep C.had fallen asleep D.were sleepy 选哪个?为什么.

C fallen 动作发生在found 之前,也就是所谓的:过去的过去 ,用过去完成时态!