________ is known to us is that the 2012 Olympic Games will be held in London．
________ is known to us is that the 2012 Olympic Games will be held in London．
A.It
B.What
C.As
D.Which
答案及解析： B
________ is known to us is that the 2012 Olympic Games will be held in London．
A.It
B.What
C.As
D.Which
答案及解析： B