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【题目】What makes the air dirty?

The smoke factories makes the air dirty.

A. of B. in C. from

【答案】C

【解析】

句意:—什么使空气变脏了?—来自工厂里的烟使得空气变脏了。A.---中的;B. --里面;C.来自。smoke from factories来自工厂里的烟,因此选项A符合题意,故答案为:C。

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