prep rc

kun861010

According to one expert, the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria as that the breeds have relatively few founding members.

A.      the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria

B.      the cause of genetic irregularities in many breeds of dog is not as much their being bred for looks or meeting other narrow criteria as much

C.      it is not so much the cause of genetic irregularities in many breeds of dog that they are being bred for looks or meeting other narrow criteria as much

D.     it is not so much the cause of genetic irregularities in many breeds of dog is their being bred for looks or meeting other narrow criteria so much

E.      it is not so much the cause of genetic irregularities in many breeds of dog to be bred for looks or to meet other narrow criteria

答案是a，为什么it在这里不能用呢？

果汁软糖

而且it后面没有逻辑主语

sayysong

问题不在it，在于C，D，E的平行不对。
C -- it is not so much the cause of ... as much as that ...
D -- it is not so much the cause of ... so much as that ...
E -- it is not so much the cause of ... as that ...
都是用the cause 和 the breeds (dogs)比较
而A -- the cause ... is not so much that dogs ... as that the breeds ... 是dogs和breeds(dogs)比较，这样才平行。