---Mum, I've been studying English since 8 o'clock．________ I go out and play with Tom for a while?---No, I'm afraid not．Besides, it's raining outside now．A.Can'tB.Wouldn'tC.May notD.Won't
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A解析从语境不难看出，问话者是一个孩子，他/她想婉转地征询妈妈的许可．四个选项中，can与may可以表“许可”，但在否定式问句中，not在主语之前时，助动词/情态动词/be动词与not必须采用合成式．故排除C项．