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?

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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?
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?

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

这个是主语从句。it是形式主语,后面 what controls the flow of carbon dioxide in and out the atmosphere today.是真正的主语。由于主句里缺主语,又根据意思,所以要用what, that无意义。
意思是:如今,众所周知是什么控制着二氧化碳进出大气层。

你可能以为that放进去成为了强调句,不要看到It is后面就以为一定要加that.
但是事实上,这句话你还没有真正搞清楚,“what controls the flow of carbon dioxide in and out the atmosphere today”作understood的宾语,所以,what引导后面的宾语从句。