现在完成时强调“所指的动作” is still occurring .句中那个
First run in 1867 and still taking place every summer不是现在完成时的所指对象,be one of the oldest races in the United States.描述的是客观事实,与持续发生是无关的,这个要分着看.也就是说,不能翻译或凭感觉作判断.提取句子主干the Belmont Stakes （）one of the oldest races in the United States.你知道怎么填了吧.
a large amount of按语法只可以+u 不过一些美国人自己都搞不懂这个.乱+c ……