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It is pretty well understood_______ cont...

It is pretty well understood_______ controls the flow of carbon dioxide in and out the atmosphere today.

A. what              B. when             C. that          D. how

 

A 【解析】 试题分析: 句意:现在人们非常清楚是什么控制着二氧化碳进出大气层。分析句子结构可知it是形式主语,后面的主语从句缺少主语,用连接代词,故选A。 考点:考查名词性从句  
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