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【单选题】

Once environmental damage ______, it takes many years for the system to recover.

A、had done
B、is to do
C、does
D、is done
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根据网考网移动考试中心的统计，该试题：

20%的考友选择了A选项

1%的考友选择了B选项

13%的考友选择了C选项

66%的考友选择了D选项

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