Having failed many times,he regretted_ His parents advice(follow) 多次失败后,他后悔没听父母的建议.

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Having failed many times,he regretted_ His parents advice(follow) 多次失败后,他后悔没听父母的建议.

following regret doing sth

应该是not to follow,根据句意应该是否定的形式
reget to do是遗憾未地(事情未做)
reget doing是遗憾的(做过某事)
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