答案：A

选A。考查状语从句的省略。句意: 尽管这个学生在最近的科学比赛中被评为最好的, 他仍然很谦虚。although引导的状语从句和主句为同一主语the student, judge与the student为被动关系, 要用过去分词结构, 完整结构为Although the student was judged to be the best in a recent science competition。故A项正确。