题目内容：

Nowadays more and more people are moving to the countruside because the air there is much better...
Nowadays more and more people are moving to the countruside because the air there is much better than ____ in the city.
A:one B:it C:this D:that 为什么不选B啊?

优质解答

选B说明the air in the countryside和the air in the city是指同一件事情,这是矛盾的,that就是指the airin the city和前面的主语是同一类但不是同一个