Unit 1 When was he born Section A 一般过去时的被动语态

Unit 3 How was your school trip？ Section A (1a-2d)

Unit 5 TOPIC 2 Section A 课件 1

Unit 1 When was he born Section B 课件 2

鲁教版 六上 Unit8 Section A 1

（课件5）When was it invented

（课件7）When was it invented