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