1 ___is known to us all is that the 2008 Olympic Games will take place in beijing.
问题描述：
1 ___is known to us all is that the 2008 Olympic Games will take place in beijing.
A.It B.What C.As D.Which
3.__ is reported in the newspaper,talks between the two countries are making progress.A.It B.As C.That D.What
答
B,主语从句,修饰ALL,在从句中做主语.只能用WHAT.
B,定语从句,有逗号隔开,引导词又是在句首,只能选AS