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【单选题】

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

B.has done
C.will be done
D.is to be done
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根据网考网移动考试中心的统计,该试题:

61%的考友选择了A选项

15%的考友选择了B选项

9%的考友选择了C选项

15%的考友选择了D选项

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