GWD的一道比较省略动词的题目

qiongle

According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is good for cardiac health.

• Awild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is
• Bwild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be
• Cwild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be
• Dtotal fat of wild animals is less than livestock fed on grain and they have more fat of a kind thought to be
• Etotal fat is less in wild animals than that of livestock fed on grain and more of their fat is of a kind they think is
  

正确答案 B

选了A，觉得B里面省略的do会产生total fat和live stock比较的歧义，所以没有选？这里难道不会产生歧义吗？另外，什么时候助动词可以省略？

qiongle

自己顶上去，最近论坛木有人吗？

qiongle

自己顶一下，求解答