题目内容
A与E是两个不能同真的判断,根据( )由E真，从而推出A假。
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甲说：“王某或者是原告，或者是被告。”乙说：“不对，他既不是原告，也不是被告。”丙说：“你们说得都对。”丁说：“我认为甲和乙说得都不对。”由此可知
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