请问这篇文章为什么开头用现在完成时

题目

请问这篇文章为什么开头用现在完成时
Dan Robinson has been worried all week.Last Tuesday he received a letter from the local police.In the letter he was asked to call at the station.Dan wondered why he was wanted by the police,but he went to the station yesterday and now he is not worried anymore.At the station,he was told by a smiling policeman that his bicycle had been found.Five days ago,the policeman told him,the bicycle was picked up in a small village four hundred miles away.It is now being sent to his home by train.Dan was most surprised when he heard the news.He was amused too,because he never expected the bicycle to be found.It was stolen twenty years ago when Dan was a boy of fifteen!
现在完成时不是应该 从过去持续到现在吗 这是过去的某段时间一直在i做某事 应该是过去进行时

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