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

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• where must the puma have come from 其中must have done是什么用法?
• 1.Our modern civilizition must not be thought of as ____in a short priod of time.A.being created B.having been created答案是B,A错在哪里?这句话该怎么理解呢?2.Iwas astonished to hear that the car cost 50000 yuan.这里为什么使用cost 呢,是什么用法?3.We must seize every good opportunity once ut is given,or the loss can never be made up for.这里的made up for要怎么理解呢?4.Iknow the sports meeting is to take place.这句话可不可以换成 I know the sports meeting is about to take place.为什么?5.－Where have you pu
• 1、club ,wants ,art ,he ,join ,to ,the.连词成句2、go,when,the,to,they,zoo,do?连词成句3、come,Eric,where,from,does?连词成句4、takes,an,me,lunch,hour,to,it,make.连词成句5、home,how,your,it,from,to,is,supermarket, the, far?连词成句6、Students must follow the ruies at school.改为一般疑问句7、Do they have to go to bed now?作肯定回答8、Don't listens to music in the hallways.单句改错9、I play ping-pong with Ted.用现在进行时改句子10、你姐姐通常几点去上班?____ _____does your sister usually go to work?11、你为什么喜欢长颈鹿?____ ___
• 现在完成时疑问句只用have?今天看新概念第三册的第一课.课文前的问题是：Where must the puma have come from?为什么用have 疑问句一定用have?
• where must the puma have come from,怎么翻译,有的说 must have done,可是come不是done的形式啊?
• 新概念第三册的第一课:"where must the puma have come from?
• where must the puma have come from?
• where must the puma have come from?对过去的事进行推测,疑问句和否定句中要用can和can't.这句话中的must是不是用错了?
• 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?
• where must the puma have come from?请仿照这个句型造几个句子.请附带中文意思..
• The light is out in her room.she to bed A.must have gone B.had gone C.must be going D.must go答案是选A的,为什么,我不懂.这个是考 have gone to的用法?
• Yesterday I have come back from China.这句话里有Yesterday ,为什么还能用现在完成时呢?