Once the balance of nature is disturbed,it is. 这里为什么不填非谓语形式disturbrd?
人气:168 ℃ 时间:2020-05-14 11:22:57
解答
可以成为非谓语形式的: Once disturbed,the balance of nature is likely to take at least 25 years to restore. --------这里,Once disturbed 就是非谓语形式,代替时间状语从句Once the balance of nature is disturbed.