题目内容
10、Once harm ______ to the environment, it takes years to have the system recovered．
A．does B．is done C．will be done D．be done
试题答案
10、B
相关题目
Once harm ______ to the environment, it takes years to have the system recovered．
A．does B．is done C．will be done D．be done
查看习题详情和答案>>Once harm ______ to the environment, it takes years to have the system recovered.
| A．does | B．is done | C．will be done | D．be done |
Once harm ______ to the environment, it takes years to have the system recovered.
| A．does | B．is done | C．will be done | D．be done |