问题

Nowadays people are more concerned about the environment ________ they live.

A:what
B:which
C:when
D:where;

正确答案是：

同类题型

into sportsWhen young ,he had a_____about becoming a famous football player

It is________to have such hot weather in July. [ ]

is easier than doing.

hen I was at school, I had to learn aTang poem by__________each week.