I toured Zhang Jiajie I was deeply impressed with its beautiful scenery.A. For the fust

问题补充：

I toured Zhang Jiajie, I was deeply impressed with its beautiful scenery.

A. For the fust time

B. At first

C. It was the first time

D. The first time

答案：

A. For the fust time

B. At first

C. It was the first time

(答案→)D. The first time

解析： the first time作连词，引导时间状语从句。