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【题目】If you live in Changchun, you may notice that the air in winter is not as _______as it is during the summer.

A.cleanB.cleanerC.cleanestD.cleaning

【答案】A

【解析】

句意:如果你住在长春,你可能会注意到冬天的空气不像夏天那样干净。

考查形容词原级比较。clean干净的,是形容词的原级;cleaner更干净的,是形容词的比较级;cleanest最干净的,是形容词的最高级;cleaning打扫,是现在分词或动名词。as+形容词的原级+as,表示“和……一样……”,故选A

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