问题描述: there used to be some trees in this field .完成反意疑问句 1个回答 分类:英语 2014-11-09 问题解答: 我来补答 答案是: didn't there 或者是:usedn't there ? 手工翻译尊重劳动欢迎提问感谢采纳 展开全文阅读