I've arrived by train为什么不是I arrived by train?话说过去时是过去的动作,和现在无关,而此句来自新概念2,lesson2,她到了,这个也是和现在没有关联了啊,为什么这个用的是have arrived?这两种都可以用吗

‘I’ve just arrived by train中的 这两句英语的区别?I arrived by train.I've arrived by train. 这句句子语法对吗I've arrived by train a moment ago. 英语句子结构改写：I arrived by train a moment ago.可以改写成：I’ve arrived by train for a moment.若错,请指出. I've arrived by train为什么不是I arrived by train?话说过去时是过去的动作,和现在无关,而此句来自新概念2,lesson2,“她到了”,这个也是和现在没有关联了啊,为什么这个用的是have arrived?这两种都可以 I've arrived by train为什么不是I arrived by train?话说过去时是过去的动作,和现在无关,而此句来自新概念2,lesson2,她到了,这个也是和现在没有关联了啊,为什么这个用的是have arrived?这两种都可以用吗 I arrived by train a moment ago.的同义句 'What a day!' I thought.'It's raining again.' Just then,the telephone rang" thought"不用think? It was my aunt Lucy.'I've just arrived by train,' she said.'I'm coming to see you.'为什么arrived用这个时态? 我刚刚到达上海,英语怎么说?是不是I've just arrived in Shanghai. I've () here for more than thirty years.A.worked B.arrived C.come D.learned I guess that I've been blessed because I've got you by my I ________the day before yesterday,I’ve _________for 2days.A.arrived,come back.B.reached,returned C.got,returned back D.arrived,been back为什么选D I ______ the day before yeaterday . I’ve _____ for two days.A.arrived ,come back B.reached,returned C. got,returned back D. arrived, been back 跪求I've just arrive by train.的意思 I'm just disappointed by what you've done. As long as I've got it by then i've already taken by someone什么意思 翻译 I've read a few books written by Dickens.