求GWD-29-Q24高手解答！！

kudoucliff

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.

1. wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is
   
   
2. wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be
   
3. wild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be
   
4. total fat of wild animals is less than livestock fed on grain and they have more fat of a kind thought to be
   
5. total 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
   这题答案选B，我选A；我觉得B那个“do”应该不能省啊~~求高手解答！
   

evilleo

我不是高手。我解答这道题的思路是，首先they指代不明。排除A E. 然后注意比较的两方。C将wild animals和that（指fat）比较了，D将fat和livestock比较了，都是不对了。因此选B.
再看A，我觉得错误就在they指代不明。根据曾经做过的题，我觉得do可以省略，也可以保留。
谢谢

kudoucliff

谢谢啦~~指出A的错误就行了……
我总觉得还是不能省……prep语法笔记上说，有宾语的情况下不能省，比如Jim eats more meat than does Tom. 如果省略does的话就会造成歧义“Jim eats more meat than he eats Tom”，但是没有meat的情况下就可以省略does……

evilleo

我今天看OG。觉得如果造成歧义的话，还是不应该省的。这种情况也包括系动词be。好多省略都造成歧义。