【正确答案】 A

【答案解析】[理由] 1) regret+V-ing 后悔曾经……
[例] I regret telling him the truth.
=I regret having told him the truth.
(我真后悔告诉了他实情。)
2) regret to V 抱歉要……
[例] We regret to tell you that you didn't pass the test.
=We're sorry to tell you that you didn't pass the test.
(我们很抱歉要告诉您，您考试并没有及格。)
根据上述及语意，故(A)应为正选。