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【题目】I ____my homework when someone knocked at the door.

A. am doingB. was doing

C. did

【答案】B

【解析】

句意:我正在做我的家庭作业,这时有人敲门。

am doing现在进行时;was doing过去进行时;did过去式。根据句中when someone knocked at the door可知,这里表示过去的某个时间正在做的事情,应用过去进行时,故选B

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