问题补充:
is known to us all is that the Olympic Games will take place in Rio de Janeiro.
A. It
B. What
CAs
D. Which
答案:
A. It
(答案→)B. What
C. As
D. Which
解析:考查名词性从句。本题考查what引导的主语从句,从句中缺少主语,故用关系词what引导。句意:众所周知,奥运会将在里约热内卢举办。故B正确。
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