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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
分析句子結(jié)構(gòu)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(dǎo)詞只能是what。
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