英语单选题____is known to all is that the chinese government is s

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英语单选题
____is known to all is that the chinese government is sparing no efforts to reduce air pollutions.A.it B.As C.which D.what详细语法以及前三者区别

答案是D,what引导主语从句并作主语从句的中的主语.
选项AC,that引导名词性从句时不能作句子成分故错
选项B,it.是形式主语须把第二个is去掉
如果用 as 则是非限制性定语从句须把 is that去掉换成逗号
_what is known to us all is that the Chinese goverment has spared no efforts toprotect people from fake food
=it is known to us all that the Chinesegoverment has spared no efforts to protect people from fake food
=as is known to us all , the Chinese goverment has spared no efforts to protectpeople from fake food

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