题目内容
已知： (1)除非李彦考上了北大，否则宋艺考上了央财。 (2)只有张博没有考上清华，宋艺才会考上央财。 (3)如果张博没有考上清华，那么赵莉也没有考上南大。 (4)或者赵莉考上了南大，或者周全没有考上厦大。 以下哪项如果为真，可得出“李彦考上了北大”的结论
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