9. This preference for exogamy,Gutman suggests, may have derived fromWest African rules governing marriage,which,though they differed from one tribal group to another,all involved some kind of prohibition against unions with close kin.
首先从插入语的they 能看出which 指代的事rules不是marriage,其次如果which 紧跟rules 的话,那么governing marriage 就要放到句子最后了,结构很乱。 而且阅读和语法的规则也不太相同,杨鹏难句是训练阅读水平的,选的材料确实有可能和改错的原则冲突,不过这个题就算是在改错里出现这么不表达我也觉得是最优的。 在改错里,which一般是就近修饰,跳跃修饰一般出现在A of B 的情况下,根据句意判断,最后,遵循的大原则还是避免歧义,像这个题不可能产生歧义,跳跃修饰也说得过去