____ is known to all,china is a developing country.

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____ is known to all,china is a developing country.
A It B As C That D What
我知道选 B啦,定语从句,可是谁能给我解答下C和D为什么错了?选C和D变成别的从句不行吗

B
As is known to all 是个非限制性定语从句,as 代替整个主句china is a developing country,其它选项无此功能.
如果用It,要说："It is known to all【that】china is a developing country
如果用What,要说：“What is known to all【is that】china is a developing country
再问： What is known to all【is that】china is a developing country 请问这是什么从句？
再答： What is known to all【主语从句】is【系动词】 that china is a developing country【that 引导的表语从句】

____ is known to all,china is a developing country. ____is known to all ,China is a developing country _____Amer As is known to all, China is a developing country( )( )(属于）t As is known to all china is a developing country英文翻译中文 China is a developing country,---- is known to all as 和 whic As is known to all,China is a developing country.的意思? China is known ____ a developing country.A.as B.with C.for D （What) is known to us all is that China is a developing coun 1.___ is known to us all is that China is a developing count China is a developing country.同义句 China i____ is a developing country. China is a developing country 同义