题目列表(包括答案和解析)
The air in Beijing is getting much ________ now than a few years ago．
A．clean
B．cleaner
C．cleanest
D．the cleanest
The air in Beijing is getting much ________ now than a few years ago．
clean
cleaner
cleanest
the cleanest
The air in Beijing is getting much ________ now than a few years ago．
clean
cleaner
cleanest
the cleanest
| A．clean | B．cleaner | C．cleanest | D．the cleanest |
| A．clean | B．cleaner | C．cleanest | D．the cleanest |
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