C a friend of my grandfather’s意为“我爷爷的一位朋友 .这是一个双重所有格.由于man是第一次提及.因此也要用不定冠词. 查看更多

 

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My frien, who ________ on the International Olympic Committee all his life, is retiring next month.

[  ]

A.served

B.is serving

C.had served

D.has served

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