The boy in the exam is a student in Class Nine.A. catching cheatingB. caught cheatedC. c

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A. catching cheating
B. caught cheated
C. catching cheated
(答案→)D. caught cheating
解析：考查非谓语动词。the boy与catch是动宾关系，应该使用过去分词作后置定语，相当于who was caught cheating，排除A、C；catch sb doing sth撞见某人正在做某事，排除B。故选D。