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

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

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