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题目内容
设全集U={1,2,3,4,5,6,7,},A={x|1≤x≤6,x∈N
*
},则?
U
A=( )
A.?
B.{7}
C.{1,2,3,4,5,6}
D.{1,2,3,4,5,6,7}