How often are the Olympic Games held?

How often are the Olympic Games held? 选择：How often are the Olympic Games held? How often are the Olympic Games held?()four years.要说明理由,其他的为 The Olympic Games are held how often are the Olympic Games held.里的game为什么要加s,hold为什么要用过 the Olympic Games are held once ___ 一道英语选择题：-How often the Olympic Games held?-( A ) four years The winter Olympic games are held every four years The olympic games are held (every four years) 如题 The olympic games (are)?held every four years. 1.-How often does the Olympic Games take place?-_______. where were the first Olympic Games held?