___________ is known to us all that the world weather is get

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___________ is known to us all that the world weather is getting warmer and warmer.
A It B What C As D Which

选A
这个是固定搭配：
It is known to us all that.众所周知.
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再问： It 在从句中作的什么成分，为什么不用as
再答： 1. It 在这个句子中做的是形式主语，指代后面的the world weather is getting warmer and warmer，以避免句子前面过于冗长，后面过于单一。真正的主语是：the world weather is getting warmer and warmer 这个句子也可以写成：That the world weather is getting warmer and warmer is known to us all. 2. 如果要用as的话，句子则要变成：As is known to us all, the world weather is getting warmer and warmer. 这是由as引导的非限制性定语从句

___________ is known to us all that the world weather is get __is well known to us all is that the 2010 world expo will b ___is known to us all is that the earth is smaller than the 26.It is known to all that the US is about the same size as （）is known to us all is that the old worker ,for ()life was what is known to us all is that the 2008 Olympic Games will () is known to us all is that the 2008 Olympic Games will ta what is known to us all is that the old scirntist,for whom l 35 .is known to us all is that the old scientist,for life wa ＿is known to us all is that the 2012 Olympic Games will take ___ is known to us all is that the Olympic Games will take p 英语翻译It is a truth well known to all the world that an unmarr