How can I make sure that Google knows my content is original?

"Google crawls site A every hour and site B once in a day. Site B writes an article, site A copies it changing time stamp. Site A gets crawled first by Googlebot. Whose content is original in Google's eyes and rank highly? If it's A, then how does that do justice to site B?" Kunal Pradhan, Ahmedabad, India

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Russian subtitles provided by Mike Shakin.