He worked hard, he passed the exam.A. in a resultB. as result C. as a resultD. for a resu

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A. in a result
B. as result
(答案→)C. as a result
D. for a result
解析：考查固定词组。固定词组as a result结果是；强调上下文的因果关系。句意：他学习很努力，结果他通过了考试。