The telephone had been ringring for there minutes before it was answered.这个句子是过去完成进行时,求各位老师同学详细讲下,这句话是怎么体现过去完成进行时的

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• The telephone had been ringring for there minutes before it was answered.这个句子是过去完成进行时,求各位老师同学详细讲下,这句话是怎么体现过去完成进行时的
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