【题目】Smoke from factories _______ the air _______. ( )
A.make; dirtyB.makes; cleanC.makes; dirty
【答案】C
【解析】
句意为工厂排放的烟雾污染了空气，该句时态为一般现在时，主语Smoke为单数第三人称，谓语动词应用make（使，让）的单三形式makes，make sb/sth+形容词意为使……怎么样，dirty意为脏的，AB皆不符合题意，故选C.
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