The Russian rocket designer has died. Fo...

The Russian rocket designer has died. For many years, he ______ as an important assistant to the father of Soviet space program.

A．serves

B．was serving

C．served

D．has served

C 【解析】试题分析：考查时态。本题使用一般过去时，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。故C正确。考点：考查时态

考点分析：

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