题文
While she _______ TV in the sitting room, the bell _______.
| A．watches; rings | B．was watching; rang |
| C．is watching; rang | D．was watching; was ringing |
While she _______ TV in the sitting room, the bell _______.
| A．watches; rings | B．was watching; rang |
| C．is watching; rang | D．was watching; was ringing |
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