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— As we know, health is above wealth. Mo...

As we know, health is above wealth. More and more people care about the quality of air.

I couldn’t agree with you more. The air requires  ________ to keep us healthy.

A.be improved B.improving C.to improve

 

B 【解析】 句意:——我们知道,健康高于财富。越来越多的人关心空气质量。 ——我完全同意你的看法。空气需要改善以保持我们的健康。 考查主动表被动。A. be improved被动语态;B. improving动名词;C. to improve动词不定式。根据英语语法,require(要求、需要)后面可接doing主动表被动。B选项符合句子结构,故选B。  
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