语法大全987中233题，牛牛们帮个忙~~

浆果

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（C）
(E) and fatigue among shift workers was lowered while raising

C选项中 while raising 不是应该是 while have raised 从而跟题干中的  have reduced sickness 形式对应才能对吗？
谢谢各位啦

carlosh

这个。。 我只能说有do sth while doing sth这种用法的，具体你可以去搜索一下帖子，很多问题搜索一下帖子能解决，如果不能解决的再来问效果会更好，因为不见得所有的人会回答你的帖子

fielcy

while doing 是一种省略主语+be
只要从句主语和主句主语一样

winzero

这个句子的句意是为了表示在have done 这个动作的同时，raised production efficiency in various industries. 所以要用doing吧

白羽撒旦boy

while the circle has been raising the efficiency ,主句。伴随状语，主语及主动词部分可省略。