-ed与-ing的区别比如：There are students and people from all walks of life _____（volunteer）to work in the EXPO site.答案是volunteering,为什么不是-ed呢,区别是什么呢

分类: 作业答案 • 2022-09-25 21:19:10

问题描述：

-ed与-ing的区别
比如：There are students and people from all walks of life _____（volunteer）to work in the EXPO site.
答案是volunteering,为什么不是-ed呢,区别是什么呢

答