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This book ___ Lucy's.Tom's name is on its cover.A.can't be B

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This book ___ Lucy's.Tom's name is on its cover.A.can't be B.mustn't be C.may not be
选啥,
还有一个辨析的
may be not 与may not be 有区别吗
A:can't “不可能,一定不…” 如He can't know this.
B:mustn't “不许(表示禁止做某事)”如You mustn't park here.
C:may not be “或许不…”如He may not know her address.
此句意为“这本书【不可能】是Lucy的.因为书的封皮上是Tom的名字.”所以选A.
辨析:①may not be 中的may是情态动词、用法类似于情态动词can:后加动词原形,表否定时直接在情态动词后面加not +动词原形.当二者都表示“可能”时、其区别在于may用于肯定句、can用于否定句.所以上面的选择题中C项意为“【或许不】”、而不当“不可能”讲,因为may表示“可能”时用于肯定句.
②may be not这样三个单词的说法中的may是情态动词,在句中构成主系表结构,如He may be not a soldier.他【可能不是】军人.
再问: 你看看这个 http://zhidao.baidu.com/question/165702232.html 是不是真的有这种用法额?
再答: 老外的语言论坛上也有过关于这个问题的帖子~如: ①She may not be at school. => There's a possibility that she is not at school. ②She may be not at school, but ... => True, she is not at school, she's at home, but she's at home studying right now as if she were in school. 又如:Rainy days may be not the most beautiful,but to say love to ... 所以这种说法也可以~ 否定词not具体放在哪种位置,也要根据说话人想要强调的意思而定~