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..

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Ihappened_______withhimwhenhewashitbyastone.A.IwastalkingB.talkingC.totalkD.tobetalking为什么是D不是C,为什么是

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..
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..

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..
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.

when 表示当时的那个时候 已经有很明确的时间状语了 用进行时