A new genetically engineered papaya was <produced not by seed companies who have been motivated by profit, which was the case with most genetically modified cross previously approved for commercial use, but> university and United States Department of Agriculture researchers who allowed growers to use it free of charge. Answer C C. produced not by profit-motivated seed companies, as was the case with most genetically modifited crops previously approved for commercial use, but by D. not produced by profil-motivated seed companies, which was the case with most genetically modified crops previously approved for commercial use, but was producted by PP语法笔记里的D选项解释: was not produced by..., but was produced by 结构不平行 which 使用错误 我可以了解which使用错误..但是我不了解的是为什麽was not produced by...,but was produced by的结构是不平行? 谢谢大家的帮忙! --

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