he's worked at a hospital since last year.这里的he's 是 he is 还是 he has 还有就是 he is gone 与he has gone 区别是什么啊。

he worked in a lawyer's office years ago ,but he is now working at a bank 为什么一个用work in一个用work at He worked as a doctor at first.是什么意思 How often have you worked abroad?改错Since 1949 he has left hos hometown.改错第一句到底是什么？ he's worked at a hospital since last year.这里的he's 是 he is 还是 he has 还有就是 he is gone 与he has gone 区别是什么啊。 请教英语介词at in 的用法I was having dinner (at) a restaurant.He worked (in) a lawer's offive years ago,but he is now working (at) a bank.sat (at) the same table. —How did you finish your work so quickly?—Mr Wang's suggestion ________ fine.A.worked on B.worked out C.worked well D.worked at he worked hard _____it.He learned by himself.He worked hard _____it.Now he is a great magician.A.inB.onC.for D.at 选什么 为什么 _______ at his paper over the weekend,Neil didn’t finish it.A.As he worked hardB.Hard as he worked C.How he worked hard D.How hard he worked work for work at work in1.he is working for a big firm2.tony worked in a lawyer's office years ago3.he is now working at a bank请问可不可以互换,如果不可以的话是为什么? In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin he worked very hard at English and finally he s——in passing the English exam . I first met Tony three years ago.He ___ at a bookshop at the time.A.has worked B.was working C.had worked D.is working 1、During the days ________,he worked as a servant at the Browns. During the days___.he worked as a servant at the Browns this is all the money he_____(save) since he worked as a teacher at this school he has worked at...和he has been worked at..有什么区别?哪个对呢? Tony worked in a lawyer’s office years ago,but he is now working at a bank.为什么前面用work in,后面用work at?两者的介词有什么区别? He has worked there (s) last year