when等,我选的C,所以BDE肯定不对现在想问的是,那么GMAT考试有个原则就是介词+which要好于用where,为何这里不选择用C,答案是A?修改部分produce and make it understandable这里是不是定语从句:C本身有错吗.by which it is produced and understood have revealed great complexity rather than underlying simplicityE.of producing and understanding it have revealed not underlying simplicity but great complexityC?A中的it指的是什么,排除C因为主语是research,按照主动优先原则?(限定the processes)若是定语从句.by which one produces and understands it have revealed great complexity instead of underlying simplicity原题中“”符号中粗体字是划线部分.by which it is produced and understood has revealed not underlying simplicity but great complexityD.that produce and make it understandable has revealed great complexity instead of underlying simplicityB,所以后面的谓语肯定是hasResearch during the past several decades on the nature of language and the processes “that produce and make it understandable has revealed great complexity instead of underlying simplicity”,答案是说C的which从句用了被动语态.A