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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
答案:
解析:

what引导主语从句,what在主语从句中作主语。that引导主语从句时只起引导作用,不作任何成分;whenhow分别表示时间和方式,在主语从句中作状语。


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