(2012年石家庄质量检测)Once ________，such a chance might never come again.
| A．losing |
| B．lost |
| C．to bo lost |
| D．having lost |
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(2012年石家庄质量检测)Once ________，such a chance might never come again.
| A．losing |
| B．lost |
| C．to bo lost |
| D．having lost |
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