(2009·江苏高考)He did not regret saying what he did but felt that he it differently.
A. could express
B. would express
C. could have expressed
D. must have expressed
网友回答
A. could express
B. would express
(答案→)C. could have expressed
D. must have expressed
解析：选C 考查情态动词的用法。根据句意可知他觉得本来能够用别的方式表达的(却没有那样做)。显然是对过去的事表示遗憾，因此应该使用could have done，表示本来可以做却未做。