标题: OG中While作连词的用法 [打印本页] 作者: Abby2015 时间: 2016-3-8 21:30 标题: OG中While作连词的用法 Recently implemented “shift-work equations” based on studies of the
human sleep cycle have reduced sickness, sleeping on the job, fatigue among
shift workers, and have raised production efficiency in various industries.
(A) fatigue among shift workers, and have raised
(B) fatigue among shift workers, and raised
(C) and fatigue among shift workers while raising
(D) lowered fatigue among shift workers, and raised
(E) and fatigue among shift workers was lowered while raising
OA is C 我的问题是C中while作为并列连词和have reduced表示一个对比的关系，那么while 后面raising为什么是ing形式呢？