新概念英语,这里为什么用完成时.this one must have been in the possession of a private collector and somehow managed to escape.为什么不是this one muse be in the possession of a private collector ...
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![新概念英语,这里为什么用完成时.this one must have been in the possession of a private collector and somehow managed to escape.为什么不是this one muse be in the possession of a private collector ...](/uploads/image/z/14172114-66-4.jpg?t=%E6%96%B0%E6%A6%82%E5%BF%B5%E8%8B%B1%E8%AF%AD%2C%E8%BF%99%E9%87%8C%E4%B8%BA%E4%BB%80%E4%B9%88%E7%94%A8%E5%AE%8C%E6%88%90%E6%97%B6.this+one+must+have+been+in+the+possession+of+a+private+collector+and+somehow+managed+to+escape.%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AFthis+one+muse+be+in+the+possession+of+a+private+collector+...)
新概念英语,这里为什么用完成时.this one must have been in the possession of a private collector and somehow managed to escape.为什么不是this one muse be in the possession of a private collector ...
新概念英语,这里为什么用完成时.
this one must have been in the possession of a private collector and somehow managed to escape.
为什么不是this one muse be in the possession of a private collector ...
新概念英语,这里为什么用完成时.this one must have been in the possession of a private collector and somehow managed to escape.为什么不是this one muse be in the possession of a private collector ...
must have done sth.对已经发生了的事情的肯定推测,这只美洲狮已经跑掉了,是之前属于private collector的,已经是以前的事情了,所以要用have
这里推断的是它是一个私人收藏家驯养的,不知是何原因成功逃了出来,说明驯养这个事情发生在逃出来之前,则必定是过去已经完成的事。所以用过去完成时
must have done表示过去完成时,must表示肯定的推断。因为in the possession of a private collector 这个状态发生的时间早于或等于动作managed to escape。
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must have been 表示对此刻之前一段时间内某个动作或状态的推测。
在本句中,this one是刚刚被发现的,所以作者估计它此前一定是由私人豢养的。
描述从过去某事起到现在为止的状态应当用现在完成时。
供参考。