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