I am often asked whether I regret __________my PhD project.
A no to finish
B． not have to finish
C． having not finished
D． not having finishing
正确答案：D
regrettodosth．后悔要去做某事；regrethavingdone\/doingsth后悔做过某事其否定形式regretnothavingdone／doingsth．题干意思：别人经常问我是否对未能完成PhD计划而感到后悔
