在英语语法中，过去完成时被动语态被用于描述在过去某个时间之前已经发生的被动事件。过去完成时被动语态由“had been"和过去分词构成。在这篇文章中，我们将介绍一些常见的过去完成时被动语态的例句。
例句
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The project had been completed before the deadline. 在截止日期之前，这个项目已经完成了。
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The book had been read by many people before it was returned to the library. 在这本书被还回图书馆之前，它已经被很多人阅读过了。
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The car had been fixed by the mechanic before it was picked up by the owner. 在这辆车被车主接走之前，它已经被机修工修好了。
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The letter had been written by the time she arrived home. 她回到家之前，那封信已经被写好了。
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The cake had been baked before the guests arrived. 客人到达之前，这个蛋糕已经烤好了。
结论
过去完成时被动语态在英语语法中扮演着重要的角色。通过这些例句，我们可以更好地理解和运用这个语法结构。记住，当你在描述一个过去某个时间之前已经发生的被动事件时，过去完成时被动语态是一个非常有用的工具。
