问题 更新时间2023/4/3 12:59:00 __________ 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-金融学-大学英语4