2016兰大网院大学英语(3)课程作业-C(共16页).docx

精选优质文档-倾情为你奉上大学英语(3)课程作业_C交卷时间：2016-11-22 10:49:35一、单选题 1. (4分)I can still remember that it is since the 1990s, _ we began to use cell phones,_ the number of mobile users has greatly increased A. while,when B. when,what C. before, that D. when,that 得分： 4 知识点： 大学英语3 答案 D 解析 2. (4分)I failed in the last exam and only then _ the importance of studies. A. I realized B. I had realized C. had I realized D. did I realize 得分