问题补充：
If there are trees, the air in our city will be cleaner.
A. fewer, much
B. more, more
C. more, much
D. much, more
答案：
A. fewer, much
B. more, more
(答案→)C. more, much
D. much, more
解析：句意：如果有更多的树，我们城市的空气将会更清新。more更多，many的比较级, much…的多，用于修饰比较级。故选C
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