题目内容：
__________ 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
参考答案：
选择题：__________ how to operate a switchboard, I had to
- 题目分类：河南财经政法大学-法学（专升本）-大学英语4
- 题目类型：选择题
- 查看权限：VIP
A.Not known
B.Not to know
C.Not knowing
D.Having not known