how long have't you heard from him

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how long have't you heard from him
是 heard from 还是 heard of
还是 hear from & hear of?
为什么不是 heard from
前面是have 的完成时啊

确实要用heard过去分词结构.
此处用heard from.
heard from意思是你多有没有收到他的音讯了.
heard of意思是听说过,听人提起过过,不能用how long
例：Yes,i heard of you.
He is the man you never heard of.
Trends you haven’t heard of – Innovation in College Media.

how long have't you heard from him Dear Jim,How are you?I have not heard from you for a long ti 3.-Have you heard from him yet?A.I don't mind B.Yes,I have I haven't heard form Sam for a long time.Have you seen him l How long have you ＿ from university? I don't think you have ever heard of him,( 句型转换:I haven't heard from him for a long time. His family haven't heard from him for a long time. How long have been away from your t( 填空 i haven't heard from him recently. Have you heard from Marry? Have you heard from ___recently?