Since the Italian government began a crackdown on the black market in the 1970's, the amount of looted antiquities smuggled out of Italy dropped by a 50 percent decline.
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Aamount of looted antiquities smuggled out of Italy dropped by a 50 percent decline
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Bamount of looted antiquities smuggled out of Italy has experienced a 50 percent decline
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Cnumber of looted antiquities smuggled out of Italy has declined by 50 percent
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Dnumber of looted antiquities smuggled out of Italy declined by 50 percent
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Enumber of looted antiquities smuggled out of Italy has dropped by a 50 percent decline
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正确答案: C