I told him the news ＿＿＿be came back yesterday.A. until B. as soon as C. unless

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解析：词义辨析。until直到……时，在……以前，引导时间状语从句；as soon as 一……就……，引导时间状语从句；unless除非，引导条件状语从句。句意：昨天他一回来，我就把这个消息告诉了他。依据句意选B。