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【多选题】
已知“史密斯并非既是哲学家又是法学家”为真，则下列（）为真。A.
史密斯或者不是哲学家，或者不是法学家。
B.
史密斯是法学家，但不是哲学家。
C.
史密斯既不是哲学家，也不是法学家。
D.
如果史密斯是哲学家，他就不是法学家。
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