题目内容

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

试题分析：句意：现在日照的空气比起几年前的空气变得更加清新了。分析：考查比较级的用法，现在的空气和几年前的空气进行比较，运用比较级。Clean的比较级在后接er, 因此选择第二项。故选 B
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