单选题 It is obvious that the sports games are no longer amateur affairs; they have become professionally______.

【正确答案】 B

【答案解析】[解析] 很明显，体育运动不再是业余项目，而是作为一种专业项目展示的。lay off解雇；lay out展示，摆出；put off推迟；put out扑灭。故答案为B。