40. 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.
B. the of genetic irregularities in many breeds of dog is not as much their being bred for looks or to meet other narrow criteria as much
A is right
但全句的中文要怎么翻? so much that 是片语?
不是...而是...
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