名词性从句一道选择题It is pretty well understood that control the flow

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名词性从句一道选择题
It is pretty well understood that control the flow of carbon dioxide in and out the atmosphere today.
问题：这里control sth.为什么是名词性的呢

这是一个主语从句,it作为形式主语,指代的是control the flow of carbon dioxide in and out the atmosphere today.即,在本复合句中作为真正的主语,在句子中起名词作用的句子,其功能相当于名词词组,因此是名词性的.
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名词性从句一道选择题It is pretty well understood that control the flow 单句改错：it is pretty well understood how control the flow of ca 英语,名词性从句 It is pretty well understood______controls the flow It is pretty well understood ___controls the flow of carbon 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 翻译 It is not yet pretty well understood what made the rainfo It is pretty well understood today ___ causes the change of 帮忙翻译It is well understood that 名词性从句选择题1.It is not ______ that this situation will continue