[单选题,7.6分] __________ 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

[单选题,7.6分] __________ 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

出自：河南城建学院-道路桥梁与渡河工程-大学英语4

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