2. 外语
  3. At ________, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.

At ________, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.

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问题 At ________, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.
选项 A、its most basic
B、its basic
C、the most basic
D、the basic
答案A
解析 形容词最高级题。形容词最高级可用于“at one’s+形容词最高级”固定结构中，表示最高程度。此处应用its替代photography’s，故本题答案为A。类似的结构还有at its best、at his worst、at her happiest等。
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