Question

I'm moving to the countryside because the air there is much fresher than _______

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

Answer 1

答案C
句意为“我要迁往乡村去，因为那里的空气比城市的空气新鲜”．显然空白处所填一词指代air, air属不可数名词，故用that．"