A. The ex post facto clause.
B. The commercial clause.
C. The due process clause.
D. The enforcement clause.
【答案与解析】
A state law was enacted in January 2013 prohibiting unauthorized copying of published books and makes it a crime. P, a professor at a college who made a few copies of a book for his students in June 2012 was prosecuted. What constitutional provision would be most helpful to P’s defense? ( ).
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