My friend, who      on the International Olympic Committee all his life, is retiring next month.
A．servedB．is serving C．had servedD．has served
D

試題分析：考查時態(tài)題。句意：我的一個朋友已經(jīng)為國際奧委會工作了一輩子，他下個月就要退休了。指他已經(jīng)為奧委會服務(wù)了一輩子了，使用現(xiàn)在完成時表示動作持續(xù)到現(xiàn)在。故D正確。
點評：時態(tài)的考查要根據(jù)上下文的語境，同時要抓住句中的關(guān)鍵詞。
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