Moreandmorepeoplehavealow-Clifeandtheairisgettingmuch ...

问题详情：

 More and more people have a low-C life and the air is getting much

     than a few years ago.

A. clean     B. cleanest    C. cleaner    D. the cleanest

【回答】

C

知识点：形容词比较级

题型：选择题