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.
问题描述：
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.
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