英语语法问题 有例句An accident that occurred in the skies over the Gr
英语语法问题 有例句
An accident that occurred in the skies over the Grand Canyon in 1956 resulted in the establishment of the FAA to regulate and oversee the operation of aircraft in the skies over the US,...accident后边的那个that为什么要放在那儿,可以省略吗