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名词性从句连接词的选择.___ is known to us all is that China is a develo

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名词性从句连接词的选择.___ is known to us all is that China is a developing country.
1.___ is known to us all is that China is a developing country.
A.Which B.what
C.as D.It
2.___ is known to us that China is a developing country.
A.Which B.As
C.What D.It
1B 2D
麻烦帮我说说如何区分这两题,同时说说怎么不能选as?
名词性从句连接词的选择.___ is known to us all is that China is a develo
第一个是主语从句,.what is known to us all 是主语部分,后面的is是谓语,主语从句中在选项里只能选what作为引导词.
第二个it is known to us that···应该是一种固定句型,意为“我们都知道···”it做句子的形式主语,that China is a developing country是真正主语.
至于为什么不用as,是因为as有自己的搭配,应该是As is known to us,China is a developing country .是定语从句
这个考察的知识点不同,而且不同的小词有自己的搭配,要注意区分.