- You seem familiar with Mr. John?-Of course we together for three years in the 1990s.A.

问题补充：

- You seem familiar with Mr. John?

-Of course, we together for three years in the 1990s.

A. have worked

B. were working

C. are working

D. worked

答案：

A. have worked

B. were working

C. are working

(答案→)D. worked

解析：句意：你似乎很熟悉约翰先生？当然，我们在20世纪90年代在一起工作了3年。句中又表示过去的明显的时间状语in the 1990s，所以动作只表示过去发生了，比没有持续到现在，只强调过去，用一般过去时，故选D