问题
选择题
The air in Beijing is getting much _____________ now than a few years ago. [ ]
A. clean
B. cleaner
C. cleanest
D. the cleanest
答案
答案：B
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The air in Beijing is getting much _____________ now than a few years ago. [ ]
A. clean
B. cleaner
C. cleanest
D. the cleanest
答案：B