knocked
很常用的句式：过去式 + when + 过去进行时
表动作的中断.
knock at the door 敲门
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句型就是典型的：
过去式 + when + 过去进行时
表动作的中断（过去进行时的动作被过去式的动作所打断）
someone ( ) at the door when she was cooking in the kitchen.
4个回答
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