核心问题
Two years later, her father disappeared, never to be heard from again.
hear from 中的 from 是介词, 它的宾语呢?
词典解答
有一种分析方法,使我们能够很容易地理解这种结构的特点:把不及物动词+介词结构看作是一个及物动词(look at, hear from, look after, agree on), 而把介词的宾语看作整个动词的宾语。在被动句中这个宾语便变成了句子的主语：
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I heard from my sister. → My sister was heard from (by me). 我收到姐姐的信。
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She looked after her son. Her son was looked after. 她照看她的儿子。
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We arrived at a conclusion. A conclusion was arrived at. 我们得出了结论。(参见 look at, agree on , passives )