There used to be ________ air pollution in Sunshine town.But now it’s very clean.

问题描述:

There used to be ________ air pollution in Sunshine town.But now it’s very clean.
A.little B.few C.a little D.a few

选C.既然说明现在clean了,那么过去应该是有污染的,用a little.pollution污染不可数,不能用few,a few修饰.little表示否定,不符合题意.