Unlike human runners, who broke the four-minute mile in 1954 and they consistently recorded faster times ever since, horses in classic races such as the Kentucky Derby have had winning times with little improvement: Secretariat's world-record-breaking Derby tine of 1:59 2/5, for example, was set in 1973 and remained unsurpassed more than a quarter of a century later.
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Athey consistently recorded faster times ever since, horses in classic races such as the Kentucky Derby have had winning times with little improvement
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Bthey have consistently recorded faster times ever since, those of horses in classic races such as the Kentucky Derby have shown little improvement in winning times
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Chave consistently recorded faster times ever since, horses in classic races such as the Kentucky Derby have shown little improvement in winning times
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Dhave consistently recorded faster times ever since, in those of classic races such as the Kentucky Derby, horses have had winning times with little improvement
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Econsistently recorded faster times ever since, those of horses in classic races such as the Kentucky Derby have shown little improvement in winning times
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正确答案: C