题目内容：

I first met Lisa three years ago.She ________ at a radio factory at the time.
A.has worked B.was working C.had been working D.had worked

优质解答

答案B 根据上下文我们可推测为这里指的是“三年前的”情况,表示“当时他正在一家无线电厂工作”.查看原帖>>