OG13--第38题 求解~~！

xiaoxiaoxxliu

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
答案：E
对于主谓宾全的句型来说，主语之间的比较不是应该在后面补出do吗？加do是为了显示这是一个可以发出动作的名词，因而确定是主语，进而确定是主语对比。。。

这个题纠结死我了，快考试了，求大神解救~~

irenechl

当不会引起歧义的时候,谓语动词是可以省略的 ]

xiaoxiaoxxliu

就是说这个因为很明显是calves和those的比较，不会是宾语比较（因为

对象不具有可比性）所以可以省略do？？
这个是从句意上来判断？？

xiaoxiaoxxliu

那A呢？and前后算不算不平行？？可不可以两个动词共用一个情态动词？