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TheairinBeijingisgettingmuchnowthanafewyearsago.A.cleanB.cleanerC.cleanestD.thecleanest哪个正确,理由?

题目详情
The air in Beijing is getting much _____ now than a few years ago.
A.clean B.cleaner C.cleanest D.the cleanest
哪个正确,理由?
▼优质解答
答案和解析
B.后面有than,可知前面要填比较级,又因为是二者之间的比较,所以B