请问The city’s ancient building remain as good as before.为什么是the city’s而不是of？

few改为fewest (one of+形容词的最高级形式)

as . as before 这里的 before 只是常用词组 as . as 后面跟的一个副词,并非固定搭配.After recovering from his injury, he goes to the gym as often as before.as usual 是俚语,表达“一如往常”之意,并不存在前后比较的性质. As usual, he goes to the gym on Monday.

the building is in the city center. in the city center不是地点状语,是介词短语作表语用.

西安是保存完好古老城墙的城市之一.