单选题 ______ in the company for three years, Mark has become experienced in business negotiations.
【正确答案】 A
【答案解析】[解析] 考查分词作状语。主句的主语Mark和分词的逻辑主语是一致的，故用现在分词；又分词所表示的动作发生在主语谓语动作之前，故用完成式的分词。