The workers are talking about the doctors and the offices they visited yesterday.A. which

问题补充：

The workers are talking about the doctors and the offices they visited yesterday.

A. which

B. who

C. that

D. where

答案：

A. which

B. who

(答案→)C. that

D. where

解析：考查定语从句，先行词有人也有物的时候，要用关系代词that。所以选C。