T-9-27 请教大家一下

Away90

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.

1. that produce and make it understandable has revealed great complexity instead of underlying simplicity
   
   
2. of producing and understanding it have revealed not underlying simplicity but great complexity
   
   
3. by which it is produced and understood has revealed not underlying simplicity but great complexity
   
   
4. by which it is produced and understood have revealed great complexity rather than underlying simplicity
   
   
5. by which one produces and understands it have revealed great complexity instead of underlying simplicity
   
   
   Key：A
   
   我觉得至少谓语应该是have，因为主句的and，所以首先排除了A，请教大家~
   

wildmantomba

这题的讨论很长 可在这里见
http://forum.chasedream.com/GMAT_SC/thread-14367-1-3.html

shirleylittl

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.

主语是 Research.(什么样的research呢，during .... on...)........has ......