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【单选题】

This is the second time she ______ improvement on that equipment.
A、had made
B、made
C、is making
D、has made

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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

12%的考友选择了B选项

6%的考友选择了C选项

73%的考友选择了D选项

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