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