In the animal kingdom, weakness can bring about aggression in other animal.上面这句出自2011年高考英语广东卷阅读理解A第一句,我有两个疑问:1. 其中的 aggression in 可以换成 aggression from 吗?2. 为什么其中的 animal 用单数不用复数?
They _______(arrive) in new york,they are in the hotel now.They _______(go) away, they are back at home now.Everyone _______(go) home, the office is empty now.请问这三个句子改用完成时还是过去时,还是都可以呢?