【題目】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:如果你住在長春,你可能會注意到冬天的空氣不像夏天那樣干凈。

考查形容詞原級比較。clean干凈的,是形容詞的原級;cleaner更干凈的,是形容詞的比較級;cleanest最干凈的,是形容詞的最高級;cleaning打掃,是現(xiàn)在分詞或動名詞。as+形容詞的原級+as,表示“和……一樣……”,故選A。

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