og-233求教

z198424

233. 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

答案是c,但是为什么用raising呢?while的用法又是什么?

谢谢

andrew_li

sickness, sleeping on the job and fatigue among shift workers are the three things that have been reduced while production efficiency is the only thing that has been raised. while should be used to better convey this idea. The reason for using raising is that the whole thing after while is a participal phrase, which acts as an adjective here.