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We all know trees play an important role in _______up the air.

A. clean B. cleaning

C. cleaned D. Cleans

B

【解析】

试题分析:句意:我们都知道树在清洁空气中扮演了很重要的角色。介词in后跟动词时要用动词的ing形式,故选B。

考点:考查非谓语动词的用法

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