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问题详情

__________ 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

时间：2021-09-01 20:55 关键词：联大河南城建学院道路桥梁与渡河工程大学英语4

答案解析

C

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