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When Jane fell off the slide,the other children ( )

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When Jane fell off the slide,the other children ( )
1.couldn’t help to laugh 2.could not avoid to laugh 3.couldn’t help laughing 4.could not stop but laughing.
原因写详细点(有什么语法或词组之类的),劳驾各位了.我还有很多问题没人答,麻烦高手也去看看,
When Jane fell off the slide,the other children ( )
couldn’t help laughing ,
can't help doing,固定搭配,"禁不住...",这里是过去时,所以用couldn’t help laughing