I first met your sister ten years ago, when she at a supermarket as a salesgirl. A. has wo

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

A. has workedB. had worked(答案→)C. was workingD. had been working解析：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。

对的，就是这个意思

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