搜狗做题网it is pretty well understood what controls the flow of carbo
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it is pretty well understood what controls the flow of carbon dioxide in and out today.
what 引导什么从句，it是不是形式主语，如果是形式主语可以用what吗，可不可以用that what？
what 引导什么从句，it是不是形式主语，如果是形式主语可以用what吗，可不可以用that what？
it是形式主语,what引导的是主语从句,是真正的主语.这里不能用that,两者的不同是what在从句中担当成分（这里做从句主语）,而that不担当任何成分,只起连接作用.例：It is true that the sun rises in the east.
it is pretty well understood what controls the flow of carbo
英语翻译It is pretty well understood what controls the flow of c
这个题目怎么理解It is pretty well understood ____ controls the flow
It is pretty well understood ___controls the flow of carbon
单句改错：it is pretty well understood how control the flow of ca
名词性从句一道选择题It is pretty well understood that control the flow
It is pretty well understood____controls the flow of carbon
翻译 It is not yet pretty well understood what made the rainfo
It is pretty well understood today ___ causes the change of
It's pretty well understood_controls the flow of carbon diox
1.It is pretty well understood_controls the flow of carbon d
英语,名词性从句 It is pretty well understood______controls the flow