I toured ZhangJiajie, I was deeply impressed with its beautiful scenery.
A. The first time
B. For the first time
C. It was the first time
D. At first
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(答案→)A. The first time
B. For the first time
C. It was the first time
D. At first
解析：四个选项中只有The first time可以作为连词，直接接从句。For the first time第一次；It was the first time第一次，后加that从句；At first首先。句意：当我第一次游览张家界时，我就对它美丽的风景流连忘返。