She heard the front door open and heavy footsteps in the hall

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• She heard the front door open and heavy footsteps in the hall.如果是动词为什么不用过去时态?.请分析这个英语句子：She heard the front door open and heavy footsteps in the hall：这个句子中的open是动词还是形容词？如果是动词为什么不用过去时？
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• She heard the front door open and heavy footsteps in the hall
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