王老师:19139051760(拨打)复制微信 题目 更新时间:2023/4/3 __________ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures. A.Not known B.Not to know C.Not knowing D.Having not known 答案 登录 注册 参考答案:C 出自:联大 >> 河南财经政法大学大学英语4 河南财经政法大学继续教育学院