新概念3中第一课 A puma at large中,HAVE的用法疑惑新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector an

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新概念3中第一课 A puma at large中,HAVE的用法疑惑新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector an
新概念3中第一课 A puma at large中,HAVE的用法疑惑
新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector and somehow managed to escape.为什么第二句用的是HAVE ,而全文用的都是HAD.奇怪（this one must have been in the possession of 为什么不是 this one must had been in the possession of ）

新概念3中第一课 A puma at large中,HAVE的用法疑惑新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector an
1）这只puma 已经在野外出现了,而在它出现前,从未有关于动物园丢失puma的报道,所以第一句当然用过去完成时.
2）这只puma 虽然是走失了,但过去一定为某private collector所有,所以用must have been in the possession of .其实不管是过去还是过去的过去,都只能这样表达.must had been in the possession of 是错的,因为按照英语语法规则,情态动词后只能用动词原形,该句中的must是情态动词,其后只能用动词原形have,而不能用过去式 had.

must后面不是加动词原型吗

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must have been 固定词组一定（对过去事实肯定的推测）
因为按照英语语法规则，情态动词后只能用动词原形, 该句中的must是情态动词，其后只能用动词原形have, 而不能用过去式 had. had been （过去完成时是把时间推移到过去某一时间之前，与现在不发生联系，由＂had + -ed分词＂构成。它的主要用法有三个，即“已完成用法”，“未完成用法”和“虚拟用法”．已完成用法表示一个动作或状态在过去某一时间或动作之前已经发生或完成.未完成用法表示一个动作或状态在过去某一时间或动作之前已经开始，一直延续到这一过去时间，而且到那时还未结束，仍有继续下去的可能性。）have been（现在完成时表示到说话时为止（或到现在为止）已经发生或完成了（不一定结束）的动作或状态。句式有肯定句式、否定句式、一般疑问句和特殊疑问句。现在完成时常被just、already、yet 等副词修饰。强调的是这一动作与现在的关系。现在完成时表示到说话时为止（或到现在为止）已经发生或完成了（不一定结束）的动作）
this one must have been in the possession of a private collector and somehow managed to escape这只美洲狮一定是属于一位私人收藏家的,不知怎么设法逃出来了
e.g：
must be 一定；一定要；肯定是
must have 必须拥有；非有不可
must have been 一定（对过去事实肯定的推测）
must have done 必定做了…（表示对过去的推测）
must be going 该告辞了；必须去
must be off [口]该走了
must needs 偏要；偏偏
must be valid 必须实事求是 etc.

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新概念3中第一课 A puma at large中,HAVE的用法疑惑新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector an a puma at large求新概念英语3第一课“A puma at large” 的MP3格式的新概念英语3 第一课中关于 at large文章标题中是a puma at large 在文章最后一句中用的是 is (still) at large 还有在新东方的网课中他举了一个例子 brid flu is at large请问一下什么时候用at large 新概念英语3第一课“A puma at large”新概念英语3第一课的课后习题2,我选择b,但答案给出的是a,但这个答案无法理解.原题：What particular piece of evidence persuaded the experts that a puma had been seen in the vi A puma at large的疑问新概念第三册的第一课题目是 'A puma at large',为什么不是 'A puma is at large'?课文的最后写的是 ...a puma is still at large.还是题目是A puma (which is) at large的省略? 有谁知道A puma at large在英语新概念三册的第几课? （重金酬谢）新概念英语第3册第一课作文怎么写紧急!如题：就是A puma at large 的那篇课文的课后有偏作文 Describe the occasion when the woman picking blacking saw the puma .Expand the following into a paragraph of 《新概念英语》（第三册）第一课《A Puma at Large》Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken ser 新概念3第一课puma at a large课后的多项选择题中的结构题（新版的是17页）___________________it immediately ran away.a) Observing her b)On being observedc)Having been observed d) On her being observed选什么呢原因? 新概念3第一课中有句话不明白,the experts were now fully...为什么now可以用于一般过去时?好纠结啊原句是 the experts were now fully convinced taht the animal was a puma.是第一课的新概念英语第三册习题的问题第一课中1、What particular evidence persuaded the experts that a puma had been seen in the village?为什么要选A.The puma had not attack the woman.而不选B.The woman had described the animal she had se 新概念第三册的第一课:where must the puma have come from?第三册的第一课where must the puma have come from? 新概念3第1课、第三课的疑问Lesson1Paw prints were seen in anumber of places and puma fur was found clinging to bushes.Several people complained of 'cat-like noises' at night and abusinessman on a fishing trip saw the puma up a tree.The exp 谁有新概念英语3的MP3听力啊,或能够下载的,Unit1 lesson1是 A puma at large逃遁的美洲狮老版新概念三第一课[A Puma at Large]课后练习题求解212 A private collector is a man who collects .(lines 15-16)a. for his own benefit b. on his own c. in private d. unknown to the public我的选择是（c）,正确答新概念三的英语问题!新概念三第一课中：A wild puma had been spotted forty-five miles south of London 中spotted后面为什么不加in,加了以后后面那块不就是介词短语作状语吗我的问题就是为什么不需要 a puma at large句句语法分析关于语法问题,新概念三册第一课puma at largefor the description given by people who claimed to have seen the puma were extraordinrily similar.请问这里的given by people given 是give的过去式吗?如果说given by people做定语修