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单选题
17.At（ ）, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.
A
A. its most basic
B
B. its basic
C
C. the most basic
D
D. thebasic
答案解析
正确答案：A
解析：
形容词最高级可以和 at 构成短语作状语，此处即为这种用法，排除B 和D。at one’s/ its +形容词最高级, 表达的含义是“处于最…的状态”。A 项中的 its 相当于 of photography 或photography’s，专指“摄影的”。句意：究其本质，摄影就是一个化学过程，在这个过程中，感光材料遇光发生变化。
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