2019学年度人教版选修八Unit5Meeting your ancestors Period4 Grammar 2课件(27张)
2019学年度人教版选修八Unit5Meeting your ancestors Period4 Grammar 2课件(27张)第3页

e.g. 我从1975年起就学英语。 I have studied English since 1975. 自12世纪以来, 中国就使用彩色印刷了。 They have done color printing in China since the 12th century.