问题
选择题
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
答案
答案：C
掌握情态动词的完成结构的用法是解此题的关键，could express过去能够表达；would express(过去)将要表达；could have expressed本来能够表达；must have expressed(表推测)肯定能表达。