A Frenchman who lost his arms and legs successfully swam across the Channel, a challenge he for two years.
| A．has been preparing | B．had been preparing |
| C．has prepared | D．prepares |
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A Frenchman who lost his arms and legs successfully swam across the Channel, a challenge he for two years.
| A．has been preparing | B．had been preparing |
| C．has prepared | D．prepares |
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