题文
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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