题目内容：
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：
选择题：Once environmental damage _________, it takes many
- 题目分类：河南财经政法大学-法学（专升本）-大学英语4
- 题目类型：选择题
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A.has done
B.is to do
C.does
D.is done