单选题：Maryregretted（　　）toJohn'sbirthdaypartylastSunday．

题目内容：

Maryregretted（　　）toJohn'sbirthdaypartylastSunday． A．notgoing
B．nottogo
C．nothavingbeengoing
D．nottobegoing

参考答案：

答案解析：

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