once （ ）to the rail ,the car will become electricity powered from the systemA.attached B.attaching C.being attached D,having attached为什么啊

once （ ）to the rail ,the car will become electricity powered from the systemA.attached B.attaching C.being attached D,having attached为什么啊 英语翻译i）Rail is not just hateii）to wish iron could turn into steel at once iii）hate iron not just steelwho can please tell me which one is the best？ 运放中rail-to-rail 如何理解? over the rail 海运 DIN rail the Receiver Unit(Nivotester) to be DIN rail mounted in Marshalling Cabinet located at Control Room.其中的DIN DIN rail 是不是德标导轨? It is half an hour's walk to get to the light rail station.（改成过去式） It _ half an hour to__tothe light rail station.这里是补充,打不下…… lt is fast to travel by light rail.(fast划线提问）( )( )it to travel by light rail rail Rail They go to the cinema once a week (once a week划线） they have been to the summer palace only once（only once划线提问） this is the longest rail line network in the world 改为同义句this is the longest rail line network （）（）（）（） 这条轻轨已经投入使用许多年了 英文翻译 The light rail （）for many years THE FLYING SCOTSMAN A RAIL ROMANCE怎么样 英语翻译light rail is a term coined in the 1970s,during the re-emergence of streetcars.In general,it refers to streetcar with rapid transit-style features,it is named to distinguish it from heavy rail. The robot b______ to work ay once. once we start tey to be the （对划线部分提问) They go to the seaside once a year.（划线部分 once a year）