Moreandmorepeoplehavealow-Clifeandtheairisgettingmuch ...

問題詳情：

 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

知識點：形容詞比較級

題型：選擇題