操作系统的作用：一是通过（）提高计算机系统的效率，二是改善人机界面，向用户提供友好的 发布时间：2017-10-31 08:39 │ 来源：www.tikuol.com 题型：填空题 问题： 操作系统的作用：一是通过（）提高计算机系统的效率，二是改善人机界面，向用户提供友好的工作环境。
题型：填空题 用所给词的被动语态填空。plant, make, hold, look, eat, clean 1. The babies after well by the nurses.2. A meeting next week. 3. All the fruit has been by the boy. 4. This kind of watch is in Shanghai. 5. The room has been by the students.6. This tree by an old man many years ago. 查看答案
