--Liu Xiang had to give up the race because of his foot.A. What a shame! B. Of course.

问题补充：

--Liu Xiang had to give up the race because of his foot.

--

A. What a shame! B. Of course. C. He was so careless.

答案：

解析：对于刘翔因为腿上而不得不放弃比赛，我们应该表示遗憾，说真可惜，A项表示此意，故本题选A。