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【单选题】

 The defense works __________ long ago to keep the enemy away.

A. were built 
B. has been built
C. had been built 
D. was built
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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

34%的考友选择了B选项

12%的考友选择了C选项

52%的考友选择了D选项

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