The air in Rizhao is getting much _____ now than a few years ago .
A．cleanB．cleanerC．cleanestD．the cleanest
B

試題分析：句意：現(xiàn)在日照的空氣比起幾年前的空氣變得更加清新了。分析：考查比較級的用法，現(xiàn)在的空氣和幾年前的空氣進行比較，運用比較級。Clean的比較級在后接er, 因此選擇第二項。故選 B
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