___ twice, the postman refused to deliver our letters unless we chained our dog.
| A．Being bitten |
| B．Bitten |
| C．Having bitten |
| D．To be bitten |
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___ twice, the postman refused to deliver our letters unless we chained our dog.
| A．Being bitten |
| B．Bitten |
| C．Having bitten |
| D．To be bitten |
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