一到英语题 求详解( ) is known to us all is that the 2008 Olympic Games will take place in Beijing A.It B.What C.As DWhich为什么选B 不选A啊

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一到英语题 求详解(   ) is known to us all is that the 2008 Olympic Games will take place in Beijing A.It      B.What     C.As       DWhich为什么选B 不选A啊

一到英语题 求详解( ) is known to us all is that the 2008 Olympic Games will take place in Beijing A.It B.What C.As DWhich为什么选B 不选A啊
一到英语题 求详解
( ) is known to us all is that the 2008 Olympic Games will take place in Beijing
A.It B.What C.As DWhich
为什么选B 不选A啊

一到英语题 求详解( ) is known to us all is that the 2008 Olympic Games will take place in Beijing A.It B.What C.As DWhich为什么选B 不选A啊
一般说来,在主语从句、表语从句和宾语从句中,如果缺少主语、宾语或表语等成分时,常用what(指物)或who(指人)来引出从句.注意:“众所周知”常用如下句式表达:①As we all know, ...②As is known to us all, ...③It is known to us all that...④What is known to us all is that...

主语从句, 用what
如果选it的话, 两个is是不对的

由于此句是主语从句,_ is known to us 是主语,而此缺少主语,用what代替. 而…is that… 是谓语,后面的是宾语

主语从句,用what代替后面的主语,因为主语太长