Once environmental damage ________,it will take many years for the system to ...

作者: tihaiku 人气: - 评论: 0
问题 Once environmental damage ________,it will take many years for the system to recover.
选项 A. is to do B. does C. has done D. is done
答案 D
解析 环境一旦遭到破坏需要很多年才能恢复过来。

猜你喜欢

发表评论
更多 网友评论0 条评论)
暂无评论

Copyright © 2012-2014 题库网 Inc. 保留所有权利。 Powered by tikuer.com

页面耗时0.0498秒, 内存占用1.01 MB, Cache:redis,访问数据库20次