Although Dr. Obetz is qualified in several areas, nutritional health is one of h

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问题 Although Dr. Obetz is qualified in several areas, nutritional health is one of her______.

选项 A、specials
B、specializes
C、specialties
D、specialists

答案 C

解析 one of后接名词的复数形式。结合选项和句意可知，specialty“专长，专攻”的复数形式specialties最适合。

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