I'm not mistaken, Rio de Janeiro of Brazil was chosen as the host city for the 2016 Olympics.
A. If
B. As
C. Unless
D. Though
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(答案→)A. If
B. As
C. Unless
D. Though
解析:A. If 如果B. As当…时候,作为 C. Unless除非 D. Though尽管;句意:如果我没有弄错,巴西的里约热内卢将在2016年举办奥林匹克运动会。故选A