答案：C

题目分析：考查固定词组have some difficulty (in) doing sth。本题是一个定语从句，先行词是difficulty, 省略掉的关系代词that/which作为had的宾语,根据固定词组have some difficulty (in) doing sth可知C正确。句意：你能想象我赢得比赛的困难吗？

点评：固定词组have some difficulty (in) doing sth做某事有困难，这是高考中常考的短语，注意其形式的变化。