问题补充：
The air in Lanzhou is getting much now than a few years ago .
A. clean
B. cleaner
C. cleanest
D. the cleanest
答案：
A. clean
(答案→)B. cleaner
C. cleanest
D. the cleanest
解析：此题重点考察形容词或副词的比较级的特殊用法，其前可以用much，even等词来修饰。
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