I haven't done.
have done 是现在完成时,现在完成时的否定句就是 haven't done sth
这里的have 不是实意动词 有的意思,而是表示现在完成时的,不能用don‘t have
I have done sth 的否定是 I don't have done 还是I haven't done 呢 到底
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