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【单选题】

He ______ in the army for ten years, and he retired last year.
A．has served

B．had served
C．served
D．had been serving
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根据网考网移动考试中心的统计，该试题：

21%的考友选择了A选项

75%的考友选择了B选项

0%的考友选择了C选项

4%的考友选择了D选项

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