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

游客2024-07-03 56

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

选项 A、had done
B、is done
C、is to do
D、does

答案 B

解析 damage与谓语“做”之间是被动关系，所以用is done。

转载请注明原文地址:http://tihaiku.com/zcyy/3661710.html

相关试题推荐

随机试题

最新回复(0)

A—ChildHelpB—DamagedBaggageC—DelayedBaggageD—-Emergency