When he knocked at the door I was cooking.
当他敲门时，我正在煮饭。
When he fell, his arm knocked the ball into the net.
他倒下时，胳膊刚好把球撞进网。
When he got there he knocked on the door no one answered.
当他到了凯蒂家门口时，敲了门，却没有人回答。
When he got there, he knocked on the door but no one answered.
当他到了凯蒂家门口时，敲了门，却没有人回答。
Hardly had he finished when someone knocked at the door.
他刚做完，就听见有人敲门。
Jim knocked down a little girl when he was running in the street.
吉姆在街上跑时撞倒了一个小女孩。
He was knocked unconscious when the car struck him.
他被车子撞得失去了知觉。
When I saw he was on fire I knocked him down and rolled him.
看到他身上着火时，我把他推倒在地，让他在地上打滚。
Jeff got knocked out when he fell and hit his head on the floor.
当杰夫跌倒了，头撞到地板上昏过去了。
Jeff got knocked out when he fell and hit his head on the floor.
当杰夫跌倒了，头撞到地板上昏过去了。
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