They ________on the sofa when the telephone_______．（ ）
| A． |
sit； rang |
| B． |
were sitting； rang |
| C． |
sat； was ringing |
They ________on the sofa when the telephone_______．（ ）
| A． |
sit； rang |
| B． |
were sitting； rang |
| C． |
sat； was ringing |
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