问题补充:
is known to us all is that the Olympic Games will take place in Beijing.
A. It
B. What
C. As
D. Which
答案:
A. It
(答案→)B. What
C. As
D. Which
解析:考察从句连词选择,根据句子结构可知,该句为主语从句,作第二个is的主语,主语从句中缺少主语,所以选择what,it是形式主语,as引导的定语从句,可以作主语,which用于有选择范围的主语。
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