怎么看C都应该改写成:Salmonid in some streams will not benefit from particular local adaptations.
因为原文说adaptation will be diluted本身是problemmatic的,那assumption怎么又会是有益?
the Congress of Industrial Organizations (CIO) organized integrated unions nationwide on the basis of a stated policy of equal rights for all, and African American unionists provided the CIO's backbone. 非裔美国工会人员支持cio 而cio是为了所有人的权利而建立。
如果选C,that this robe depicted scenes of a battle between Zeus, Athena's father, and giants的先行词只能是robe,又重复又不通顺。