How long have they built these highrises?(被动语态)

How long have they built these highrises?(被动语态) How soon will they finish these highrises?改被动语态 They have built three highrises in our neighbourhood They have read these comic books.(改为被动语态） 请教一下怎样把They have built many tall buildings.改成被动语态 Many tall 把下列句子改为被动语态.1、They have built many tall buildings . they have built a new bridge over the river改为被动语态 .They have built a bridge __________ long. 英语改被动语态.They built this house in 1900. They built a new school in the village.被动语态 they ought to have told you how much money you needed的被动语态 改成被动语态：They have offered me.