单句改错：it is pretty well understood how control the flow of carbon dioxide
答案是how→what
请问为什么是这个答案?how后面加to,请详细说明.
人气：479 ℃ 时间：2020-05-09 18:13:59
解答
it is pretty well understood what（ control the flow of carbon dioxide）
（ control the flow of carbon dioxide）作为补足语修饰what
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