The air in Beijing is getting much _____
题型:选择题
问题:
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.[ ]
A.clean
B.cleaner
C.cleanest
D.the cleanest