【题目】 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
在线课程【答案】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。
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