It is pretty well understood controls the flow of carbon dioxide in and out the atmosphere today.A．that B．when C．what D．how 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．that B．when C．what D．how

【解析】分析句子结构可知：句子属于形式主语格式；另外主句中缺少主语。双重作用的引导词只能是what。

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