_____ many times, but he still doesn’t know how to operate the machine properly.
| A．Although I have shown him | B．I have shown him |
| C．Having been shown | D．Having shown |
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_____ many times, but he still doesn’t know how to operate the machine properly.
| A．Although I have shown him | B．I have shown him |
| C．Having been shown | D．Having shown |
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