____ is known to us is that Yuan Longping called "the father

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____ is known to us is that Yuan Longping called "the father of hybrid rice" ,for ____ life was hard in the past ,still works very hard in his seventies.
A.As;whom B.What;whom C.It;whose D.As;whose
给的答案是B,最好能分析一下其它选项,

What引导主语从句
Whom表示前面的袁隆平因为那人做宾语所以这个也是宾格的
如果一开始用AS的话后面也不会这么表达啊会这样说的 as is known to us,yuanlongping……而不是这样这就是主语从句的形式~
而whose是表示某人的…… 句意明显看出来前面有for 所以说的是对……而言过去的生活是很艰辛的
it也是同理如果用it的话就要表达成it is known to us that……
不懂再补充问题吧

____is known to us all is that the old writer,for ____ life Yuan Longping is r () as "father of rice" Yuan longping,the Chinese scientist is famous for the "fathe It is known to us all that Mr.Abel is ____. Yuan longping is one of the most famous .in china. ___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 It is known to us all that email,as well as telephones,____ It is well known to us that Zhai zhigang is the first Chines （）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