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单项选择题

已知全集U=1,2,3,4,5,6,7,8,M=1,3,5,7,N=5,6,7,则=().……

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.2,4,8
D.1,3,5,6,7