The meeting ( )(begin) when we arrived there.这里可以填was beginning吗?正确答案是had begun

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The meeting ( )(begin) when we arrived there.这里可以填was beginning吗?正确答案是had begun

The meeting ( )(begin) when we arrived there.这里可以填was beginning吗?正确答案是had begun
The meeting ( )(begin) when we arrived there.这里可以填was beginning吗?正确答案是had begun

The meeting ( )(begin) when we arrived there.这里可以填was beginning吗?正确答案是had begun
不行,因为begin是瞬间动词,大多数情况下,瞬间动词不能用ing形式.(会议开始就是一瞬间的事,没有什么“正在开始”的说话)
另外,像你说的doing when do这样的情况也不是没有,只是doing那个词不能是瞬间动词(如close the door,leave,begin,start,arrive,go to bed,finish等).这个句式的意思是当某事正在进行时,突然发生了另一件事,强调when后的do的突然性.
用你的句子来举个例子:The meeting was going on when we arrived there.当会议正在进行时,我们突然到那儿了.