—Is that the small town you often refer to?—Right, just the oneyou know I used to work for

网友回答

A. that
B. which
(答案→)C. where
D. what
解析：句意：—那个是你经常提到的小镇吗?——是的,你知道正是那个我曾经在那儿工作多年的城镇。you know插入语。先行词the one代指的是the city。空格后的定语从句中work是不及物动词，不接宾语，所以这个定语从句不缺少主语，宾语和表语，故排除AB。what不用于定语从句，所以不选D。故选C。