The air in Rizhao is getting much _____
题型:选择题
问题:
The air in Rizhao is getting much _____ now than a few years ago .
A.clean
B.cleaner
C.cleanest
D.the cleanest
The air in Rizhao is getting much _____ now than a few years ago .
A.clean
B.cleaner
C.cleanest
D.the cleanest