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

A. clean B. cleaning

C. cleaned D. Cleans

B

【解析】

試題分析：句意：我們都知道樹(shù)在清潔空氣中扮演了很重要的角色。介詞in后跟動(dòng)詞時(shí)要用動(dòng)詞的ing形式，故選B。

考點(diǎn)：考查非謂語(yǔ)動(dòng)詞的用法

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