is well known to everyone, the Olympic Games every four years． [ ] A．It; are hel
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________ is well known to everyone, the Olympic Games ________ every four years．
[]A．It; are held
B．As; take place
C．That; happen
D．This; break out
试题答案
答案：B
解析：前一空as为关系代词，引导非限制性定语从句，后一空A、B两项都是正确的，若选A项则应将句中逗号改成that才对。