__________ 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

__________ 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：河南城建学院大学英语(四)

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