关于新概念第三册第一课的问题?有一句是 As no pumas had been reported missing from any zoo in the country,this one must have been in the possession of a private collector.对于肯定推测 have been 是死也不能改的吗? has 可

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关于新概念第三册第一课的问题?有一句是Asnopumashadbeenreportedmissingfromanyzoointhecountry,thisonemusthavebeeninthepos

关于新概念第三册第一课的问题?有一句是 As no pumas had been reported missing from any zoo in the country,this one must have been in the possession of a private collector.对于肯定推测 have been 是死也不能改的吗? has 可
关于新概念第三册第一课的问题?
有一句是 As no pumas had been reported missing from any zoo in the country,this one must have been in the possession of a private collector.
对于肯定推测 have been 是死也不能改的吗? has 可否?
ps：本人语法及其的烂

关于新概念第三册第一课的问题?有一句是 As no pumas had been reported missing from any zoo in the country,this one must have been in the possession of a private collector.对于肯定推测 have been 是死也不能改的吗? has 可
情态动词+完成时态,表示对过去发生的事情一种推测、懊悔等等的态度,情态动词后面是跟动词原型的,所以must后不可能是has.
he shouldn't have cheated in the exam.考试时他不应该作弊的.（他作了弊）

must have been 用于推测过去的情况.
must 后只能接动词原形,不可以用has.

这个应该是跟全文的时态相联系的。前面用的应该是过去式，现在讲的内容是过去的过去，所以用过去完成时。

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