—Is that the small town you often refer to? —Right, just the one______I used to work for years.

【正确答案】 C

【答案解析】分析句子结构可知，空处是定语从句的引导词，在从句中作地点状语。根据句意可知，先行词the one指代的是前面提到的the small town，表示地点，所以应用关系副词where引导。故选C。