It was ten years he returned to his hometown and set out to revenge his dead father.A. si

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A. since
B. that
(答案→)C. before
D. when
解析：考查连词。since 自从……以来； that因为，以至于；before在……之前；when当……时。句意：在他返回家乡为他的父亲报仇之前以后十年的时间了。故选C。