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TheRussianrocketdesignerhasdied.Formanyyears,he______asanimportantassistanttothefatherofSovietspaceprogram.A.servesB.wasservingC.servedD.hasserved为什么选C

题目详情
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
为什么选C
▼优质解答
答案和解析
C
死前,他一直以一种助手身份服务,工作.过去时