问题描述: Tina has already cut down the trees and build a house 变否定句and用不用变or? 1个回答 分类:英语 2014-11-04 问题解答: 我来补答 否定句:Tina hasn't cut down the trees and build a house yet.and不用变or,砍树和盖房子有先后顺序,or就没有先后顺序了. 展开全文阅读