题文
I have warned him of the danger ___ but he always turns deaf to my warning every time.
| A．only once |
| B．for a time |
| C．over and over again |
| D．once again |
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I have warned him of the danger ___ but he always turns deaf to my warning every time.
| A．only once |
| B．for a time |
| C．over and over again |
| D．once again |
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