have an opportunity to do与doing的区别?Last month i had an opportunity ____ at the local hospital.为什么上空填的是volunteering,而不用to volunteer

分类: 作业答案 • 2022-01-04 12:10:33

问题描述：

have an opportunity to do与doing的区别?
Last month i had an opportunity ____ at the local hospital.
为什么上空填的是volunteering,而不用to volunteer

答