While watching television, .
| A．the doorbell rang |
| B．we heard the doorbell ring |
| C．there was someone knocking at the door |
| D．we heard the doorbell rung |
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While watching television, .
| A．the doorbell rang |
| B．we heard the doorbell ring |
| C．there was someone knocking at the door |
| D．we heard the doorbell rung |
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