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    【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

    【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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