问题描述：
I first met Lisa three years ago.She _____ at a radio shop at the time.
A.has worked B.was working
C.had been working D.had worked
哪个正确,请分析一下为什么?
A.has worked B.was working
C.had been working D.had worked
哪个正确,请分析一下为什么?
问题解答：
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