My friend, who ________ on the International Olympic Committee all his life, is retiring next month.
A.servedB.is servingC.had servedD.has served在线课程D
解析:
根据主句中谓语部分(is retiring next month)可判断本句要表达的是现在的情况,因此定为现在时,排除A、C两项,而进行体的B项表未完性、暂时性,不合本句要求,故D项正确。
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