Mr.Smith has been living in London since 1978.Mr.Smith has lived in London since 1979.前句表示史密斯现在还住在伦敦，而后句不确定史密斯是否现在还住在伦敦，

Mr.Smith has been 什么hospital什么last month Mr.Smith has been here since the factory opened为Mr.Smith has been here since the factory opened为什么用has been? Mr.Smith is not at home.He___to work.A.has gone B.has been C.had been D.had gone (Mr.Smith's passport) has been issued括号里面的是什么关系啊?不是主谓,是. Mr Smith ________ to America 10 years ago and has been there___________. If Mr Smith _______ here, he would have helped youhad beenB. wasC. wereD. has been Mr.Smith has been ____in his research for more than 3 hours. mr smith has been a professor since 1994 保持原句意思：保持原句意思：mr smith has （ ）（ ）a professor for about ten years Mr. Smith _____from Canada. He____here last year A .went;has been B.has been;has come C.was;has beenD. has come ; is Mr Li has a____(bake) Mr Li has been a m___ of the Party for twenty years mr.li has been in canada for one month.he plantsto stay for____(other) two months Mr Smith ___ at this school since he ___ to Zhuhai.A:has been taught; came B:has taught; has comeC:has been teaching; has come D:has been teaching; came为什么选D?has been teaching是什么时态? Mr Smith with his parents ______ China since two years ago.A .have been in B has been C has been to说明理由 Mr Smith has a _______ daughter Mr.Smith has a (v)big room. mr li has never been to beijing,_____?a.is heb.hasnt hec.has hed.isnt he Is Mr.Smith still in Shanghai?—Yes,he ______ there for two months.A.has beenB.has goneC.has been toD.has gone to