【题目】Once environmental damage ___________, it takes many years for the system to recover.
A. has done B. is to do
C. does D. is done
在线课程【答案】D
【解析】考查被动语态。句意:环境一旦受损,系统要多年才能修复。来自do damage to.=damage is done to.
编辑:chaxungu时间:2026-04-27 03:20:07分类:高中英语题库
【题目】Once environmental damage ___________, it takes many years for the system to recover.
A. has done B. is to do
C. does D. is done
在线课程【答案】D
【解析】考查被动语态。句意:环境一旦受损,系统要多年才能修复。来自do damage to.=damage is done to.