将主动句改为被动People have used paper and prining for ages.

将主动句改为被动People have used paper and prining for ages. 句子改成被动语态 people have used paper and printing for ages -Paper and painting have been used for ages.-___.A.Good job paper and printing havebeen used for ages翻译 英语：将主动句改为被动句 将下列主动句改为被动句 将下列主动句改为被动句. 将下列主动句改为被动句 Have I to do the job myself? They have finished their work主动句改为被动句 英语主动句改为被动句. 英语 将主动语态改为被动语态 如何将主动语态改为被动语态?