I was being tested for a driving licence for the third time语法

问题描述:

I was being tested for a driving licence for the third time语法
新概念Book 2,Lesson69,But not murder中第一句,I was being tested for a driving licence for the third time.其中was being tested我不知道是什么语法?还是原文就是错的?

过去进行时的被动语态,表示过去某时间正在进行的事件.原文没有错.