题目选项分析

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 the regular diet of their cattle, having been branded to become generic-grade beef.

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 the regular diet of their cattle which have been branded to become generic-grade beef.