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It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.
A．thatB．whenC．whatD．how
C
主要測試主語從句。分析句子結構可知：句子屬于形式主語格式；另外主句中缺少主語。雙重作用的引導詞只能是what。例如：It is still doubtful what he said at the meeting yesterday。昨天他在會上說的話仍然值得懷疑。
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