They traveled , all the way up to Wisconsin .A. the northB. in the northC. northD. the so

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A. the north
B. in the north
(答案→)C. north
D. the south
解析：本题考查名词。north的意思是“北,北方,北部”,通常用作单数名词或不可数名词。句意：他们一路向北，来到了威斯康辛州。