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I didn't receive the letter because it _____(send)to the wro

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I didn't receive the letter because it _____(send)to the wrong address .
顺便解释一下过去完成时是怎么回事!我不怕费事,你也可以发题给我!爱你
还有一题,He left home as a young man and ______(not see )since.顺便解释为什么 要不仅要知其然,而且之其所有然的答案!
I didn't receive the letter because it _____(send)to the wro
1.had been sent
我没有收到信是因为地址错了(信被送到了错误的地址)
2.hasn't been seen
他年轻时离开家,直至今日.(直到今日,仍未回家,所以仍未被见到)
现在完成时的被动语态