河南成教 / 英语(四)
正确率:100%
5、
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:
佳题速递: