2. 外语
  3. He______in the army for ten years, and he retired last year.

He______in the army for ten years, and he retired last year.

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问题 He______in the army for ten years, and he retired last year.
选项 A、has served
B、had served
C、served
D、had been serving
答案B
解析 整个句子为过去时态，从时间状语for ten years可以判断这里表示过去持续的状态，所以用过去完成时，故选B。
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