Nowadays people are more concerned about the environment they live.A. whatB. whichC. when

问题补充：

Nowadays people are more concerned about the environment they live.

A. what

B. which

C. when

D. where

答案：

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。