皮皮学，免费搜题
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【单选题】
已知全集U={1，2，3，4，5，6，7，8}，M={1，3，5，7}，N={5，6，7}，则 =(   )
A.
{5，7}
B.
{2，4}
C.
{1，3，5，6，7}
D.
{2，4，8}
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