Unit+1+The+mass+media+Grammar+and+usage+基础知识练习 高中英语牛津译林版（2020）选择性必修第一册

译林牛津英语选择性必修二Unit 1 Grammar and usage基础知识练习(附答案)I .根据原句意，用正确时态改写下列句子1. He seemed to have seen the pai