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 knownB.Not to knowC.Not knowingD.Having not known 答案 登录 注册 C.Not knowing 出自:联大 >> 河南城建学院大学英语(四) 河南城建学院继续教育学院