The Olympic Games are held once . A.every four years B.each fourth year C.every-four-year D.e——青夏教育精英家教网—

摘要：The Olympic Games are held once . A.every four years B.each fourth year C.every-four-year D.every four year

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The Olympic Games are held once 　　　.

A、every four years　 B、each fourth year　　

C、every-four-year　 D、every four year

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