In an effort to shorten the time span and cut the costs needed to grow full size beef stock, many ranchers substitute cornmeal and ground bones for their cattle's regular diet, branded by them to become generic-grade beef.
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Afor their cattle's regular diet, branded by them
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Bfor the regular diet of their cattle which have been branded
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Cfor the regular diet of their cattle, having been branded
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Din place of their cattle's regular diet, for those of them branded
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Ein place of the regular diet of their cattle to have been branded by them
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正确答案: B