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
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