I met a friend of mine _____I was walking in the park.A.before B.when C.after D.if并回答为什么

分类: 作业答案 • 2021-12-20 03:37:31

问题描述：

I met a friend of mine _____I was walking in the park.
A.before B.when C.after D.if
并回答为什么

答