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

作者: tihaiku 人气: - 评论: 0
问题 Once environmental damage ______, it takes many years for the system to recover.
选项 A is to do B does C had done D is done
答案 D
解析 考点:动词被动语态。本题从句部分的主语中心词是damage“破坏”,与do是动宾关系。句意:一旦环境遭到破坏,需要很多年才能恢复过来。
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0.0465秒, 内存占用1.01 MB, Cache:redis,访问数据库20次