标题: OG10语法268题中补足谓语的问题（冰天雪地寒风赤裸求助） [打印本页] 作者: chengzi1 时间: 2010-3-25 10:17 标题: OG10语法268题中补足谓语的问题（冰天雪地寒风赤裸求助） 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
请问为什么E选项中不用补谓语动词do？？不是说A do sth than B do 的吗？这里我的理解是they require medication and gain weight，than后面不是应该补do 对应require 和gain吗？