2. 专升本
  3. ______ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures.

______ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures.

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问题 ______ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures.
选项 A、Not known
B、No to know
C、Not knowing
D、Having not known
答案C
解析
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