he regretted what silly mistakes he had made中为什么用what而不是that,how

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he regretted what silly mistakes he had made中为什么用what而不是that,how

what修饰名词,how修饰形容词,在这儿what修饰mistakes,多么愚憃的错误,感叹句he regretted that what silly mistakes..............行不行,为什么?行啊,regret后面引导了一个宾语从句,可以加that