题目内容
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 |
B
解析
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题目内容
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 |
B
解析