Yellowstone National Park is one of the older parks in the U.S.. It was established by Congress in 1872.
A. one of
B. older
C. established
D. by Congress

【参考答案】

B 应改为oldest。[解析] 因为这是一个固定句型的用法。“one of+形容词/副词的最高级”表示“最……的之一”......

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