摘要： It is pretty well understood controls the flow of carbon dioxide in and out of the atmosphere today． A．that B．when C．what D．which
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It is pretty well understood_______controls the flow of carbon dioxide in and out of the atmosphere today．
A．that B．when C．what D．which
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It is pretty well understood_______controls the flow of carbon dioxide in and out of the atmosphere today．
| A．that | B．when | C．what | D．which |
It is pretty well understood ________ controls the flow of carbon dioxide in and out of the atmosphere today.
[ ]
A．that
B．when
C．what
D．how