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【答案】Whose box is that?/Whose is that box?

【解析】

box盒子，is是，that那，whose谁的，根据所给的问号和特殊疑问词，可知句子是一个特殊疑问句，根据所给词义可以连成句子：那是谁的盒子？/那个盒子是谁的？故答案为Whose box is that?/Whose is that box?