- 讲师:刘萍萍 / 谢楠
- 课时:160h
- 价格 4580 元
特色双名师解密新课程高频考点,送国家电网教材讲义,助力一次通关
配套通关班送国网在线题库一套
He ________ the company for fifty years, first as office boy and eventually as managing director.
A.served
B.is serving
C.had served
D.has served
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