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

问题补充：

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

---Right, just the one you know I used to live 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指的上文的the small town为下文的逻辑地点状语，故选C。