Question

his young brother once wrote to him in 2005,and 〔hasn't been heard from〕since

hear from意思是收到，那么为什么要用been heard from的被动句？
指点指点谢谢！！

Answer 1

这句话的丛唯局意思是说，自从渗让2005年的那封信后，他弟山氏弟就没消息了。

been heard from 表示被听到 主语是：his young brother

如果这里听的主语是him ，在中文里，他是主语，“他再也没有弟弟的消息（再也没有听到弟弟的消息），自从2005年收到一封信后” ，那么英文就该表示为：
he hasn't heard from his young brother since ...

Answer 2

has been done 表示延续性。是指从某时开始就一直