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