To make Beijing our worthy capital, we must get it（ ）of polluted

To make Beijing our worthy capital, we must get it（ ）of polluted air, among other things.
A、collected
B、washed
C、cleansed
D、developed
【正确答案】：C
【题目解析】：本题考查词义辨析。collected：收集，采集；washed：洗，洗涤；cleansed：清洁，清洗；developed：发展。句意：为了使北京成为我们有价值的首都，除其他外，我们必须净化它的污染空气。故C选项符合题意。