过去完成时被动态是英语语法中的一种时态，用于描述在过去的某个时间之前已经完成的被动动作。下面是30个过去完成时被动态的例句，帮助你更好地理解和运用这一语法结构：
- The cake had been eaten before I arrived.
- The car had been repaired before it was sold.
- The book had been read by many people before it was published.
- The letter had been written before the mailman came.
- The house had been cleaned before the guests arrived.
- The movie had been seen by millions of people before it won the award.
- The game had been played for hours before they finally stopped.
- The test had been taken by all the students before the teacher graded them.
- The concert had been attended by many people before the singer got sick.
- The cake had been baked before the frosting was applied.
- The book had been translated into many languages before it became a bestseller.
- The house had been decorated before the party started.
- The computer had been fixed before the deadline.
- The movie had been filmed before the director passed away.
- The report had been written before the meeting.
- The project had been completed before the deadline.
- The game had been won by the home team before the visitors left.
- The book had been recommended by the teacher before the students read it.
- The cake had been ordered before the party.
- The house had been built before the family moved in.
- The movie had been edited before it was released.
- The car had been washed before it was parked in the garage.
- The letter had been sent before the deadline.
- The game had been played by both teams before the referee blew the whistle.
- The report had been reviewed by the supervisor before it was submitted.
- The project had been approved by the boss before it was implemented.
- The book had been reviewed by the critics before it was published.
- The concert had been enjoyed by the audience before the lights went out.
- The cake had been tasted by the chef before it was served.
- The house had been inspected by the buyer before the sale was finalized.
以上30个例句展示了过去完成时被动态在英语语法中的应用。通过学习和掌握这一语法结构，你可以更加流利自如地运用英语进行表达和沟通。
