【題目】 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】

試題分析: 句意：現(xiàn)在人們非常清楚是什么控制著二氧化碳進(jìn)出大氣層。分析句子結(jié)構(gòu)可知it是形式主語，后面的主語從句缺少主語，用連接代詞，故選A。

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