题文
My friend, who ________ on the International Olympic Committee all the time, is retiring next month.
| A．served |
| B．is serving |
| C．had served |
| D．has served |
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My friend, who ________ on the International Olympic Committee all the time, is retiring next month.
| A．served |
| B．is serving |
| C．had served |
| D．has served |
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