单项选择题

Once environmental damage ______, it takes many years for the system to recover.

A. had done
B. is to do
C. does

D. is done
<上一题 目录 下一题>
热门 试题

单项选择题
Everything ______ if Albert hadn’t called the fire brigade.
A. would be destroyed

B. would have been destroyed
C. will be destroyed

D. will have been destroyed
单项选择题
The students will put off the match until next week, ______ they won’t be so busy.
A. since

B. as

C. when
D. while
相关试题