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一道大学英语考试题I regret____a present to my friend when he got marr

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一道大学英语考试题
I regret____a present to my friend when he got married last month.
a.to have not made
b.not making
c.not having made
d.having not made
答案及原因.
我也认为选C,可答案是A.
egret to do(后悔没有做某事);regret doing (后悔做了某事)而not又要接在非谓语动词前面,when是现在完成时的标志,故选c.