高等继续教育 / 统考英语词汇与语法
正确率：统考%
24、Once environmental damage _ _ _ _ _ _ , it takes many years for the system to recover.
A.is to do
B.does
C.had done
D.is done
A.is to do
B.does
C.had done
D.is done
参考答案：
佳题速递：