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题目内容
（河南财经政法大学-会计学-大学英语4）
[单选题,7.6分]
Once environmental damage _________, it takes many years for the system to recover.
A.has done
B.is to do
C.does
D.is done
Once environmental damage _________, it takes many years for the system to recover.
A.has done
B.is to do
C.does
D.is done
参考答案
