高等继续教育 / 统考英语B
正确率:统考%
题型描述: 单选题
A. is to do
B. had done
C. is done
D. does
Once environmental damage _ _ _ _ _ _ , it takes many years for the system to recover.
A. is to do
B. had done
C. is done
D. does
参考答案:
佳题速递: