新概念第三册的第一课:"where must the puma have come from?

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• where must the puma have come from 其中must have done是什么用法?
• 新概念英语中的几个问题~第三册中有这个题目：The experts were now fully convinced that the animal ____ a puma A.must be B.should have seen C.can only be D.could only have been.我选择是是A 但答案是D为什么啊还有个.The woman saw"a large cat "___five yards away from her.A.at least B.four or .C,no more than D.within为什么不选择D啊,C为什么有可以.I——it all night.but I'm afraid ...A.shall mend B.am mending C.have mended D.mended 为什么不选择AWe will get used to ___ that .BILLA,hearing B.hear C.the sound D.having hea
• 关于新概念英语第三册 “a puma at large"的一个时态问题就是文章的第一段中 .the descriptions given by people who claimed to have seen the puma were extraordinarily similar.这里是"have seen" 再接下来就是 the hunt for the puma began in a small village where a woman picking blackberries saw a large cat only five yards away from her.而这里就用 “saw”!自学的哈,语法搞不懂,敬请指教啊.再请问 第二个saw可是在 hunt for the puma began 之后啊； began 是动词过去吧 在began 之前看到的不也应该是 have seen
• 新概念英语2同步练习第3~是同步练习!用所给词的适当形式填空1Who was that girl you (talk) to when i （pass）you in the street.2What (go on) in your house when i (call) on you last night?I (ring)the bell three times,but you (not answer) the door.Judging from the noise that (come) from the sittingroom,i (think) you must (have)a part.3I (write) to them three times,but I ( not receive) a relpy.4I (just have) my first driving lesson,and I (find) it very interesting indeed.5I (learn) to r
• 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,怎么翻译,有的说 must have done,可是come不是done的形式啊?
• where must the puma have come from?