问题描述：
The children chortled all the time while they were hearing the story.
The children were chortling all the time while they were hearing the story.
The children chortled all the time while they heard the story.
怎么就不行？语法不对吗？还是都可以 只是意思不一样？
The children were chortling all the time while they were hearing the story.
The children chortled all the time while they heard the story.
怎么就不行？语法不对吗？还是都可以 只是意思不一样？
问题解答：
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