...事，两者无大区别(但主语为物，动作与心理活动有关,start本身用于be starting时态时侧重于用前者) a knock at the door (敲门声) knock at the door (敲门, 指动作) ..
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... 2）knock the door撞门 3）a knock at the door一个敲门声 4）a knock on the head头上挨的一击 ...
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I was wakened by a knock at the door.
敲门声把我吵醒了。
《牛津词典》
They were interrupted by a knock at the door.
他们被敲门声打断了。
Late that evening, there was a knock at the door.
那天深夜，有人敲过门。
Mr Demirsay, known locally as Sharif, was stabbed after answering a knock at the door.
BBC: Serafettin Demirsay
The blinds were shut, and a dog barked when there was a knock at the door.
WSJ: Bond Set at $8 Million in Cleveland Kidnap Case
We had just begun the meal when there was a knock at the door.
NEWYORKER: Amundsen
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