to have been pulled down,不定式的被动完成时态和having been pulled down动名词的被动完成时态,他们有什么不同啊?求讲解

-Have you heard of the buildings_down?-Yes,it's said that they are going to make room for the new ones.-A:having pulled B:having been pulled C:pulled D:to be pulled to have been pulled down,不定式的被动完成时态和having been pulled down动名词的被动完成时态,他们有什么不同啊?求讲解 the building is said()last monthto be pulled down;to have been pulled down;being pulled down;having been pulled down应该选哪个?我觉得应该选完成时的被动语态,可这里有两个完成时的被动语态,应该选那个?求讲解,这两 The buildings in the old market have been pulled down to make ____for a new park in our cityA room B place C.area D.ground说明理由 a problem helpMost of old houses ____in the last five years .A pulled down B have been pulled down C were pulled downKey:Dwhy ,I need grammar 这道题为什么选AThe buildings in the old market have been pulled down to make __for a new park inThe buildings in the old market have been pulled down to make ________ for a new park in our city.A.room B.place C.area D.ground Mobile homes,pulled by specially designed trucks have been increasing in numbers怎么译 will have been pulled 和will be pulled的区别I suppose that when I come back in ten years'time,all these old houses ____down.A:will have been pulled B:will have pulled C:will be pulling D:will be pulled为什么不选B和C? Have you been to? have been to have not been to I have been to. i suppose than when i come back in ten year's time,all these old housesA will have pulled B will be pulling C will have been pulled D will be pulled i suppose by the time i come back in ten years time all these old houses_downa will have been pulled d will be pulled为什么选A 1、When I got there , I found the bookshop _____——the shop owner was nowhere to be found.A pulled down B have been pulled down为什么不用B 没有find sb do吗?2、In the days _____, he was still in low spirit,and it seemed hard for him have been in have gone to have been to have been 之间的区别have been in have gone to have been to have been之间的区别 He heard a big noise and had to pulled over his car to the roadside to have为什么用pulled over 而不用pull 原形 have gone to ＆ have been to 区别