一道PREP语法，平行对称方面的困惑
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 that 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A
答案的解释的 他们对逻辑对称，都表示目的。
可是我觉得他们形式可不对称了，难道以后形式 看上去不对称的 只要逻辑对称就可以了吗？？？
我又觉得这很难把握啊。。。到底应该如何了理解啊~？？？求大牛门指点指点我这菜鸟。。。
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