【题目】With many cities in China dreadfully blanketed by thick haze, the environment problem is _____ Chinese people concern most nowadays.
A. what B. which C. where D. when
在线课程【答案】A
【解析】考查表语从句；句意：对于中国许多遭受雾霾的城市来说，环境问题是现在我们所关心的。What引导表语从句，在表语从句中做concern的宾语，故选A项。