Is that the small town you often refer to?Right just the one you know I used to

问题补充：

--- Is that the small town you often refer to?

--- Right, just the one you know I used to work for years.

A. that

B. which

C. where

D. what

答案：

A. that

B. which

(答案→)C. where

D. what

解析：考查定语从句。the one 为先行词，you know为插入语。I used to work for years.

从句中缺少地点状语，所以选 where 。