题目列表(包括答案和解析)
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．which |
It is pretty well understood ________ controls the flow of carbon dioxide in and out of the atmosphere today.
[ ]
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
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
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