As we know the Changjiang River is one of rivers in the world. A. long B. longer C. the

问题补充：

As we know, the Changjiang River is one of rivers in the world.

A. long B. longer C. the longest

答案：

解析：one of后通常跟形容词的最高级，世界的河流是三个以上，故本题选C。