Dr. Kim_______for 12 years on the Board of New York University by the time she resigns next February.

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问题 Dr. Kim_______for 12 years on the Board of New York University by the time she resigns next February.

选项 A、been served
B、had served
C、has served
D、will have served

答案D

解析 一看到for 12 years,可能会倾向于选择现在完成时C选项。但后半句说到“明年2月份退休时就满12年”,所以现在还没有达到12年。因此要用将来完成时。
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