Question

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

C

解析:

That代替上文出现过的同类单数可数名词或不可数名词。 One代替上文出现过的那一个单数可数名词或不可数名词。