__is known to us all is that America is a developed country_

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__is known to us all is that America is a developed country__the First World.
选Which; belonged to ,还是As; belonged to ,

如果不是你的答案是错的,就是你的题抄写错了.我就直接说吧,下面3个结构不同,你要看清楚你的题是哪一个.
It is known to us that.
As is known to us, + 一个句子. （注意,us后面有一个逗号,这很重要）
What is known to us is that...
你这题应该是第三种,如果你题没抄错. 也就是选What , belonged to
再问：谢谢你的回答，可是题和答案都没抄错啊，我按原题抄的啊，而且我又对了一遍的
再答：如果你确定题没抄错，我肯定是What, belonging to

__is known to us all is that America is a developed country_ What is known to us all is that America is a developed count 3.___ is known to us all is that America is a developed coun __is known to us all is that the old scientist,for___life wa __is known to us all is that the old scientist, for___life w __is well known to us all is that the 2010 world expo will b __is power is a famous saying known to all. __ discovered america is well known to us all. （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 __is well known to all,the earth is round填as or it or that 名词性从句连接词的选择.___ is known to us all is that China is a develo