his young brother once wrote to him in 2005,and hasn't been heard of since为什么是hasn't been heard of 呢,hearof是收到来信的意思

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hisyoungbrotheroncewrotetohimin2005,andhasn''tbeenheardofsince为什么是hasn''tbeenheardof呢,hearof是收到来信的意思hi

his young brother once wrote to him in 2005,and hasn't been heard of since为什么是hasn't been heard of 呢,hearof是收到来信的意思
his young brother once wrote to him in 2005,and hasn't been heard of since
为什么是hasn't been heard of 呢,hearof是收到来信的意思

his young brother once wrote to him in 2005,and hasn't been heard of since为什么是hasn't been heard of 呢,hearof是收到来信的意思
意思是从2005年写信给弟弟,一直到今天都没有收到来信
用完成时表示一件事情持续至今,并对现在动作有影响

本句强调自从2005年起他就没收到回信,强调影响,用现在完成时