in a office 和 working at a bank为什么前者是in 后者是at?

In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin in a office 和 working at a bank为什么前者是in 后者是at? at post office 和in the post office一样吗? Jack is a green-hand. But all the workers ________ highly _______ his work when he finished workin这个题怎么做? 求详解和翻译.Jack is a green-hand. But all the workers ________ highly _______ his work when he finished working in the factor there is a woman teacher in the office.对a 进行提问[ ] [ ] [ ] [ ] [ ] [ ] in the office? 英语翻译A complaint by the affected tenderer and any person having or havinghad an interest in obtaining a particular public contract must reach theDepartment of Contracts or the Contracting Authority involved,as thecase may be,within four workin ing与in'有区别吗?我看到一首歌题目叫workin' day and night 如何翻译 :in the same office in a room next to the office There's a man teacher in the office(复） There()()()()in the office There's a man teacher in the office(复）There()()()()in the office He has a quick lunch in the office.He___ lunch ___ in the office. she works in an office和she works in office哪个对 she works in an office和she works in office哪个不对 she works in an office和she works in office哪个错英语 in the office和in office的意思?说完后再写几个这种类型的短语 ( )in the office( )have a computer in school Wang Lin works in a post office.He is a () There ( ) a student and a teacher in the office.