Nowadays people are more concerned about the environment they live.
A. what
B. which
C. when
D. where
网友回答
A. what
B. which
C. when
(答案→)D. where
解析：句意：如今，人们更加担忧他们生活的环境。该复合句包含一个定语从句，其先行词为the environment，且关系词在从句中作live的地点状语，故用关系副词where。而which为关系代词，在定语从句中作主语或者宾语；when为关系副词，需在定语从句中作时间状语。定语从句中关系词无what。
【考点定位】考察定语从句关系词用法。