I happened _______with him when he was hit by a stone.

问题描述:

I happened _______with him when he was hit by a stone.
A. I was talking B. talking C. to talkD. to be talking
为什么是D不是C,为什么是强调..

D,因为这里强调的是我当时正在干...,他被石头砸中的时候我碰巧正在跟他讲话,所以后面要用进行时.