Since the end of the war, many of the priceless antiques to their rightful ownersA. have

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A. have returned
B. had returned
C. had been returned
D. have been returned
解析：从时间状语Since the end of the war可以得知用现在完成时，而且antique与 return为被动关系，故用现在完成时的被动语态。句意：自从战争结束以来，许多无价的古董已归还失主。