Although there were only five athletes in the race it was a rather exciting one.A. compe

问题补充：

Although there were only five athletes in the race, it was a rather exciting one.

A. competing

B. having been competed

C. to compete

D. to be competed

答案：

(答案→)A. competing

B. having been competed

C. to compete

D. to be competed

解析：考察非谓语动词，现在分词表示正在进行的动作，伴随主语进行的动作。不定式则表示还为发生，具体的动作。根据题意五个运动员是比赛逻辑主语，不用被动语态，选A，尽管比赛中只有五个运动员参加比赛，但它仍是很激动人心的一个。