关于GMAT一道语法题的讨论，欢迎大家参与

271632852

Research 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.

            

            

                 
• that produce and make it understandable has revealed great
       complexity instead of underlying simplicity
  
                   
• of producing and understanding
       it have revealed not underlying simplicity but great complexity
  
                   
• by which it is produced and
       understood has revealed not underlying simplicity but great complexity
  
                   
• by which it is produced and
       understood have revealed great complexity rather than underlying
       simplicity
  
                   
• by which one produces and
       understands it have revealed great complexity instead of underlying
       simplicity
  

我个人支持C，我觉得produce 和understand 的主语应该是人，而且是通过processes。
而且我觉得A不好是因为题意想表达的是produce，understand两个动作
而A表述的是produce and make it understandable。强调的好像只有understand。。。