【正文】
Module 4 Great inventions Unit 1 Paper and printing have been used for ages. Module 4 Great inventions Four great inventions in ancient China: pass paper gunpowder printing Printing and paper have been invented in ancient China. They have been used for ages. printing paper Printing and paper have been invented in ancient China. They have been used for ages. 現(xiàn)在完成時的被動語態(tài): ? have/has + been + . What other do you know? A: A… has been invented . B: Yes. It has been used for ages. Practice in pai