Unit 6 When was it invented？一．重点短语1.by accident偶然;意外地     2.divide into把…分成…3.take place发生     happen发生（没有被动形式）4.all of a sudden=suddenly 突然;...

 【句子】根据默默无闻的小说制作优秀影片在美国由来已久，已经成为传统。【解析】1)adj.杰出的；优秀的；极好的She would have made an excellent teacher.她本可以成为杰出的教师。2)常见词...