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
C
【解析】分析句子結(jié)構(gòu)可知:句子屬于形式主語(yǔ)格式;另外主句中缺少主語(yǔ)。雙重作用的引導(dǎo)詞只能是what。
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