A 因为后边的句子说明他已经去夏威夷度假了.所以肯定不是布朗先生.
must 只能表示肯定推测,否定推测肯定不应该是can't .因为mustn't 表示禁止.
英语选择题（情态动词）——Look ,the light in the teacher's office is stil
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—The light in the office is still on.
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