The Yellow River is one of rivers in China.A. longerB. longestC. longD. the longest

问题补充：

The Yellow River is one of rivers in China.

A. longer

B. longest

C. long

D. the longest

答案：

A. longer

B. longest

C. long

(答案→)D. the longest

解析：句意：黄河是中国最长的河流之一。one of the + 形容词最高级 + 名词复数 最……的中之一，如：one of the most beautiful cities最漂亮的城市之一。