We have been working together since 1970.对1970划线,该如何提问?

I/we should have been working.是什么意思 We ----on it for several hours but we have not yet reached any conclusionA.work B.are working C.have been working D.have been worked We have been working here for five years.We have been worked here for five years.有什么区别 have been working 是什么时态 where have you been?we have been looking for you everywhere.i(worked out)a teaching plan in my office.为什么这里不填have been working out.had been working out; had been work out We have been working together since 1970.对1970划线,该如何提问? We have been ______for several hours but we have not yet reached any conclusion.A.working it out B.working out it C.working on it D.working it on Have been working for several years I have been working for two days. i have been working lots as He____on his new book for months before he fell ill,or we would have found it in the market.A.had been working B.has been working C.was working D.will have worked We have been ```` 现在分词完成式1.we are happy to have been working with you.2.we are happy to having been work with you.为什么 英语翻译,要通顺,谢谢Let's take a break.We have been working for a long time. we A(have been working) B(for) nearly five hours,c(let's) stop (having) a rest I first met Lisa thhree years ago when we ___at a radio station together.A.have worked B.had been working C.were working D.had worked 一道英语题目~请帮个忙,谢谢we____on it for several hours but we have not yet finished the work.A.work B.are working C.have been working D.have been worked选哪个?为什么.对不起,我没分了 Because i have been working Because i have been working hard