A. the researchers involved in the experiment B. the inspectors of the football tournament C. the referees of the football tournament D. the observers at the site of the experiment 参考答案:C 答案解析:officials一词的词义可根据它的上下文内容推断,其上下文是当referees离incident比较近时,就更可能导致误判,而当officials判罚正确时,他们离犯规地点平均有17米。据此不难推