While dancing happily at home,_______________ ．
| A．the door bell rang | B．the door bell rings |
| C．we heard the door bell rings | D．we heard the door bell ring |
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While dancing happily at home,_______________ ．
| A．the door bell rang | B．the door bell rings |
| C．we heard the door bell rings | D．we heard the door bell ring |
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