单选题 Some criminal slang is so highly developed that pickpockets, for example, can ______ a conversation in front of a victim without the person's realizing that they are discussing.

【正确答案】 A
【答案解析】A．carryon继续下去，坚持下去；B．carry away运走，使失去自控力；C．carryout执行，贯彻；D．carry off拿走，夺走。故A为正确答案。