王老师:19139051760(拨打)复制微信 题目 更新时间:2023/4/3 To tell you the truth, it.s very hard for us to help them get rid of Internet addiction. But we _________ on this problem trying to improve the situation.(1.0分)1.0 分A、had workedB、are workingC、had been workingD、worked 答案 登录 注册 答案:B 出自:超星 >> 郑州航空工业管理学院公共英语1 郑州航空工业管理学院继续教育学院