I couldn't help____ when hearing the funny story为什么选laughing 而不是laugh lauged laugs

I couldn't help____ when hearing the funny story为什么选laughing 而不是laugh lauged laugs
I couldn't help____ when hearing the funny story
为什么选laughing 而不是laugh lauged laugs

I couldn't help____ when hearing the funny story为什么选laughing 而不是laugh lauged laugs
固定句式

can't help doing 是固定搭配，是不能抑制住做某事的意思
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can't help doing 情不自禁做某事

can't help donging 情不自禁的做某事

can't help doing sth.是禁不住做某事
can't help（to) do sth. 是不能帮助做某事
根据语意是第一种意思。谢谢