i was much impressed by great changes and fast pace of life in shanghai _i came to visit this city

题目

i was much impressed by great changes and fast pace of life in shanghai _i came to visit this city
Aat the first time
Bfor the first time
Cby the first time
Dthe first time
答案D为什么不选A求详解.

答案

the first time 第一次,是名词,在句子中只能做名词的成分.
at the first time 是介词短语,是“在第一次”
句子的意思是,第一次参观这个城市的时候.