问题描述： happen的现在进行时要不要双写N 1个回答 分类：英语 2014-11-13 问题解答： 我来补答 happen vi.发生;碰巧,偶然;巧遇,偶然发现相关词句：it could happen to you it should happen to you make it happen accidents can happen happen upon making it happen let it happen when did that happen it wasn't meant to happen例句："What is happening?" 发生了什么? 展开全文阅读
