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，所以用过去完威时，故选B。

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大学英语三级A级

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