The average temperature this year is _______ that of last year.A.as not high asB.not as highC.not as higher asD.not as high as
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D解析as...as用法：as...as意为和……一样，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。其否定式为not as/so +adj./ adv. +as。故选D.