Question

I first met your sister ten years ago, when she ____at a supermarket as a salesgirl.

A．has worked

B．had worked

C．was working

D．had been working

Answer 1

C

过去进行时的用法：过去某个时间点或者时间段正在发生的事情。“十年前我初次见到你姐姐的时候她在一家超市当服务员。”选C。