____ ，but he still could not understand it.
| A．Told many times | B．Having been told many times |
| C．He had been told many times | D．Though he had been told many times |
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____ ，but he still could not understand it.
| A．Told many times | B．Having been told many times |
| C．He had been told many times | D．Though he had been told many times |
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