【正确答案】 B

【答案解析】[解题指要] 该题测试过去分词用作状语的用法。B选项Settled(得到解决)用作状语，相当于：Since their quarrel had been settled in a friendly way, their quarrel came to en end.而选项C和选项D都是表示主动语态，故小用。