In spite of all that has been said,为什么用has

In spite of all that has been said,为什么用has
新概念2的58课,为什么用has而不是have
原文是
　　The tiny village of Frinley is said to possess a 'cursed tree'.Because the tree was mentioned in a newspaper,the number of visitors to Frinley has now increased.The tree was planted near the church fifty years ago,but it is only in recent years that it has gained an evil reputation.It is said that if anyone touches the tree,he will have bad luck; if he picks a leaf,he will die.Many villagers believe that the tree has already claimed a number of victims.The vicar has been asked to have the tree cut down,but so far he has refused.He has pointed out that the tree cut down,but so far he has refused.He has pointed out that the tree is a useful source of income,as tourists have been coming from all parts of the country to see it.【 In spite of all that has been said,the tourists have been picking leaves and cutting their names on the tree-trunk.】So far,not one of them has been struck down by sudden death!