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【单选题】

It took them more than ten years to ______ the defensive works.
A、build in
B、build into
C、build on
D、build up

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参考答案：

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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

25%的考友选择了B选项

20%的考友选择了C选项

53%的考友选择了D选项

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