单选题 Three years have since we last met at the conference for Internet communication in Beijing.
A. elapsed B. discerned C. discontented D. electrified

【正确答案】 A

【答案解析】[解析] 本句的意思是“自从我们最后一次在国际互联网交流会见面以来，三年已经过去了”。elapsed“(时间)过去，流逝”为正确答案。如：Five months have elapsed since he joined the army．自从他参军后五个月已经过去了。而discerned“辨别，看清楚”；discontented“不满意的”；electrified“使充电，使电气化”都不符合句意。