David did not regret saying what he did but felt that he     it differently.
A．could expressB．would express
C．could have expressedD．must have expressed
C
考查虛擬語(yǔ)氣。根據(jù)did說(shuō)明本句是對(duì)過(guò)去情況的虛擬，故使用情態(tài)代詞+have done,排除AB。D想是對(duì)過(guò)去情況的推測(cè)，而不是虛擬。Could have done本可以做某事，實(shí)際上卻未做。句意：David不后悔說(shuō)他所做的，但是感覺(jué)他本可以用另外一種方法來(lái)做。故C正確。
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