【】is konwn to us all is that the 2012 Olympic Games will take place in London

问题描述:

【】is konwn to us all is that the 2012 Olympic Games will take place in London
A.It B.What C.As D.Which

选B.由第2个is可知,前面应该是一个主语从句,且从句中缺少作主语的引导词,因此只能用what.which表示选择,意思不对.