While having our dinner, _______.
| A．the door bell rang |
| B．our newspapers came to the door |
| C．we heard the door bell ringing |
| D．the postman brought several letters to us |
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While having our dinner, _______.
| A．the door bell rang |
| B．our newspapers came to the door |
| C．we heard the door bell ringing |
| D．the postman brought several letters to us |
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