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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:
81%
的考友选择了A选项
9%
的考友选择了B选项
4%
的考友选择了C选项
6%
的考友选择了D选项
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