it had been long before Iwent to school对吧?

it had been long before Iwent to school对吧? it had been a long time ,since sb was a girl.这个过去完成式,had been It's been so long since I had been a teacher.请问这句好如何翻译? how long has it been since you have had this engine tuned ?麻烦人工翻译一下 It wasn't long before she (discovered)____he had been lying to her How can you possibly miss the news It ________on TV all day long.为什么用has been 不用had been It's been so long It's been a long it's been a long it has long been assumed it had long been a dream of mine to travel to the west lakeit had long been a dream这种语法结构我不理解.我只会写i had a dream to bla bla请帮我解释一下这种语法结构 They have been in the library since_______.A:a long time agoB:it had been openC:eight o'clockD:two hours应该选哪个?为什么? It's been so long中文意思 it has long been known that 英语翻译they had been going out for a long time Had it not been by an accident It had been built with remarkable speed. had been doingwho had been work in...for a long timewho had been working in.for a long time我支持下面的,请问下面的对吗?