If there are trees the air in our city will be cleaner.A. less moreB. more moreC. more

问题补充：

If there are trees, the air in our city will be cleaner.

A. less, more

B. more, more

C. more, much

D. much, more

答案：

A. less, more

B. more, more

(答案→)C. more, much

D. much, more

解析：此题考查形容词的比较级，根据题干的信息可知，树木越多城市就越干净many的比较级 是more，而在比较级的前面可以用much来修饰。