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问题: 请高手帮忙解答两条题目

_______ is well-known to us all is that the 2008 Olympic Games will be held in Beijing, China.
选项
A.As B.It C.Which D.What

_____is know to everybody,the moon travels round the earth once every month.
A.It B.As C.That D.What

上面两题各应该选什么呀?两个句子句式上有什么区别呀?

解答:

(1)_______ is well-known to us all is that the 2008 Olympic Games will be held in Beijing, China.
选项
A.As B.It C.Which D.What
选D is that the 2008 Olympic Games will be held in Beijing, China.
前缺少主语 因此用主语从句 用 what引导比较合适 如果用it引导需去掉 all后的is.
(2)_____is know to everybody,the moon travels round the earth once every month.
A.It B.As C.That D.What
此句是个非限定性定语从句 用as引导.as代替逗号后的整个句子.选B