请高手帮忙看下这道题,答案给A,不太理解,请予以讲解。谢谢
-Willyoupleasestayherefortheparty?-Sorry,I____.I'llhavetogotoanimportantmeeting.Amust...
-Will you please stay here for the party? -Sorry ,I____. I'll have to go to an important meeting. A mustn't B may not C needn't D can't
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