问题描述：
—Listen Is Miss Smith giving a speech in the class
—No,it _____ be her .She has gone to Hong Kong .
A may not B mustn't C can't D needn't
讨论的结果是选B还是选C有争议,
—No,it _____ be her .She has gone to Hong Kong .
A may not B mustn't C can't D needn't
讨论的结果是选B还是选C有争议,
问题解答：
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