where must the puma have come from 其中must have done是什么用法?

where must the puma have come from 其中must have done是什么用法? where must the puma have come from? where must the puma have come from,怎么翻译,有的说 must have done,可 英语高手请进 where must the puma have come from?这是什么句型,为什么must后面不要 新概念第三册的第一课:"where must the puma have come from? where must the puma have come from?请仿照这个句型造几个句子. must have done用法 must have done的用法 must have been done must have done should/could/must/might have done用法? 关于 must have done. MUST have been done