【单选题】Since the beginning of 2013, these regulations______in most workplaces across the country. A) will be introduced B) are introduced C) have been introduced D) were introduced
【简答题】Since the beginning of 2013, these regulations ________ in most workplace across the country. (2016 年 12 月 a 级 28 题) A . will be introduced B . have been introduced C . were introduced D . are introdu...