问题描述: The river became dirty last year.The river has became dirty for ___ ___. 1个回答 分类:英语 2014-09-28 问题解答: 我来补答 The river became dirty last year.The river has became dirty for a year 再问: 为什么不是 two year 谢谢 再答: 应该是两年 The river has became dirty for two years 展开全文阅读