My friend ,who ___on the International Olympic Committee all his life,is retiring next month.应该填has served谁来给我讲解一下的

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My friend ,who ___on the International Olympic Committee all his life,is retiring next month.应该填has served谁来给我讲解一下的
My friend ,who ___on the International Olympic Committee all his life,is retiring next month.
应该填has served
谁来给我讲解一下的

My friend ,who ___on the International Olympic Committee all his life,is retiring next month.应该填has served谁来给我讲解一下的
has served指一直为奥委会服务,
is retiring next month.下月要退休,所以现在还是用现在完成

all his life是一辈子,一生的一次
has served 表示持续性的,服务

all his life一生一直在服务,是持续的,用现在完成时