英语,名词性从句 It is pretty well understood______controls the flow

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英语,名词性从句
It is pretty well understood______controls the flow of carbon dioxide in and out the atmosphere today.
答案是what ,为什么不能填that?为什么?

由从属连词that引导的从句叫做名词性that-从句. That只起连接主句和从句的作用,在从句中不担任任何成分,本身也没有词义, 因此,使用that的话,从句中的control就没有了主语
由wh-词引导的名词从句叫做名词性wh-从句.Wh-词包括who, whom,. whose, whoever, what, whatever, which, whichever等连接代词和where, when, how, why等连接副词.Wh-从句的语法功能除了和that-从句一样外,还可充当介词宾语、宾语补语和间接宾语等
因此要用what

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