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46. A study commissioned by the Department of Agricul­ture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.

(A)  associated with other calves, they will require less medication and gain weight quicker than do

(B)  associated with other calves, they require less medication and gain weight quicker than

(C)  associate with other calves, they required less medication and will gain weight quicker than do

(D)  associate with other calves, they have required less medication and will gain weight more quickly than do

(E)   associate with other calves, they require less medication and gain weight more quickly than

that if calves exercise and associated with other calves

I can't understand the above meaning.  calves is noun here?

借题发挥一下：选项B,E中在比较后面并没有补出助动词，这样的句子结构完整么？对于这个问题一直有疑惑，哪位NN不吝赐教一下？不胜感激！

某个NN写的《比较之庖丁解牛》里对这种比较有比较形式有详细的总结。

本题里因为比较的是主语，谓语动词相同，所以谓语动词可补也可以不补。前提是不产生歧义