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.
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Athe 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
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Bthe 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
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Cit 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
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Dit 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
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Eit 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
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正确答案: A