答案：C

考查主谓一致。some coaches 是先行词，who ____ to go to the Games是定语从句，定语从句的谓语动词要和先行词保持一致，所以要用复数are; as well as连接两个并列主语时，谓语动词和前一个主语保持一致， every athlete是句子主语，是单数，所以第二空用is 。选C。