一道英语单选,My friend,who__on theInternational Olympic Committer all his life,is retiring next month A served B is serving C serves D has served

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一道英语单选,My friend,who__on theInternational Olympic Committer all his life,is retiring next month A served B is serving C serves D has served
一道英语单选,
My friend,who__on theInternational Olympic Committer all his life,is retiring next month A served B is serving C serves D has served

一道英语单选,My friend,who__on theInternational Olympic Committer all his life,is retiring next month A served B is serving C serves D has served
C ,
因为A表示的是过去时,而句子的意思是说“我”的朋友下礼拜退休,所以不是.
而B,是现在进行时,他并没有正在工作,所以也不是.
C-代表的现在是,所以为正确答案
而D,表示已经工作了,所以也不是.