新概念3 16课有2个地方不明白

新概念3 16课有2个地方不明白
Mary and her husband Dimitri lived in the tiny village of Perachora in southern Greece. One of Mary's prize possessions was a little white lamb which her husband had given her. She kept it tied to a tree in a field during the day and went to fetch it every evening. One evening, however, the lamb was missing. The rope had been cut, so it was obvious that the lamb had been stolen.
When Dimitri came in from the fields, his wife told him what had happened. Dimitri at once set out to find the thief. He knew it would not prove difficult in such a small village. After telling several of his friends about the theft, Dimitri found out that his neighbour, Aleko, had suddenly acquired a new lamb. Dimitri immediately went to Aleko's house and angrily accused him of stealing the lamb. He told him he had better return it or he would call the police.1 Aleko denied taking it and led Dimitri into his back-yard. It was true that he had just bought a lamb, he explained, but his lamb was black. 2Ashamed of having acted so rashly, Dimitri apologized to Aleko for having accused him.
1denied为什么后边有个take为什么
2Ashamed of having acted so rashly, Dimitri apologized to Aleko for having accused him. 为什么这个句子用现在完成时 这是用过去式的角度写的文章呀