复数，参照英语原文如下：
The Olympic Games are considered the world's foremost sports competition with more than 200 nations participating.[2] The Olympic Games are held every four years, with the Summer and Winter Games alternating by occurring every four years but two years apart.
是单数还是复数，要看具体情况
如果是泛指奥运会就用单数，如果是指奥运会的具体项目的话，用复数。
单数
The Olympic Games was held in Beijing in 2008.
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