--- 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
网友回答
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 。