They are in the story.A. interested interestingB. interesting interestingC. interested

问题补充：

They are in the story.

A. interested, interesting

B. interesting, interesting

C. interested, interested

答案：

解析：interested感兴趣的，指人；interesting令人感兴趣的，有趣的，指物；句意：他们对这个有趣的故事很感兴趣。故选A。