The International Maths Summer Camp was held in Wuhan, the top students in maths from all

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A. bringing back
B. bringing together
C. which brought around
(答案→)D. gathering around
解析：考查定语从句。Bring back带回来；bring together集合；bring around使信服，使复苏；gather around聚集，搜集。句意：国际数学夏令营在武汉举行，聚集了来自世界各地的在数学方面最优秀的学生。bring together 是那些材料你原来手头上已经有；gather together 是所需材料还没完全到手, 必须先收集。现在分词作状语表示正在进行的伴随的动作，和句子主语是主谓关系，集合语境可知选D。原答案有误。