问题
选择题
______ is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
A．It
B．Which
C．As
D．What
答案
答案：D
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______ is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
A．It
B．Which
C．As
D．What
答案：D