I first met Lisa three years ago when we ________ at a radio station together.

A. have worked       B. had been working       C. were working        D. had worked

I first met Lisa three years ago when we ____ at a radio station together.

A. have worked      B. had been working    C. were working     D. had worked

I first met Lisa three years ago when we ________ at a radio station together．

1. A.
   have worked
2. B.
   had been working
3. C.
   were working
4. D.
   had worked