this one must have been in the possesion of a private collector请问这个句子成分怎么划分?特别是have been 这块!

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• this one must have been in the possesion of a private collector请问这个句子成分怎么划分?特别是have been 这块!
• this one must have been in the possesion of a private collector请问这个句子成分怎么划分?特别是have been 这块!
• 过去式和过去完成时的困惑.帮忙看下句子.As no puma had been reported missing from any zoo in the country,this one must have been in the possession of private collector.请问在这里为什么要把“报道”这个次说成过去完成时（had been reported）,而把拥有（possession）说成have been?
• 请问：Seldom does she get up before 10 o'clock.这是部分倒装还是完全倒装?
• ___ ___ ___ ___ the volunteers,the poor children's living conditions have improved a lot.在志愿者的帮助下,贫困孩子们的生活条件有了很大的改善.