One Sunday several former classmates gathered at Tom’s for lunch, ________ their high school reunion the year before．A.talking aboutB.having talked aboutC.to talk aboutD.talked about
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A解析talking about为现在分词短语作伴随状语。句意：一个星期天，几位汤姆以前的同学聚集在他家吃午饭，谈论着前一年的高中同学聚会的事情。