I’m moving to the countryside because the air there is much fresher than in the city. A.

问题补充：

I’m moving to the countryside because the air there is much fresher than in the city.

A. ones

B. one

C. that

D. those

答案：

A. ones

B. one

(答案→)C. that

D. those

解析：本题考查代词。选项中只有that能替代不可数名词the air。答案是C。