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
句中有than要用比较级。北京现在的空气比几年前干净多了。
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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
句中有than要用比较级。北京现在的空气比几年前干净多了。