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—— many times,I still could not understand how to operate th

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—— many times,I still could not understand how to operate the machine.
A:Having been told B:having told C:I have been told D:telling 为什么不选c
—— many times,I still could not understand how to operate th
理由很简单,如果填C,句子变成
I have been told many times,I still could not understand how to operate the machine.前后句子竟然就没有连词了!
再问: 如果在中间加and可以吗
再答: but最好
再问: 谢谢您,讲得很清晰。