At present more and more people prefer in the countryside because there is pollution in

问题补充：

At present, more and more people prefer in the countryside because there is pollution in the city.

A. living, more

B. to live, less

C. living, less

D. to live, more

答案：

A. living, more

B. to live, less

C. living, less

(答案→)D. to live, more

解析：固定结构prefer to do sth,更喜欢做某事，根据句意因为有更多的污染，故用more.