According to Dr. Chiu what makes it possible to track down any paper work is to ______.A.

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According to Dr. Chiu, what makes it possible to track down any paper work is to ______.

A.make all the imperfections of machines deliberate

B.find out the guilty creator of the counterfeit document

C.allow more imperfectly designed printers to be sold

D.mark all the printers in a special and secret way

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