【题目】The Russian rocket designer has died. For many years, he ____ as a deputy to the father of Soviet space program.
A. serves B. was serving C. served D. has served
在线课程【答案】C
【解析】描述过去所发生的动作，本句中没有反应出对现在的影响也没有延续到现在，故不要使用现在完成时。句意：俄罗斯的火箭设计师去世了。很多年来，他都充当俄罗斯的太空计划之父的角色。