134. 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

while与此同时

状语

多谢指点,可是我记得有人告诉我with/with doing + 代词. 这个代词就近指代, , 这个如何解释呢? 那么在GMAT 中看到WITH +  doing , 就一律都是错的. 是不是这样的?

连词，　that makes sense!

while

名词
一段时间；一会儿；(所需、所费的)功夫。 Rest a while 休息一会儿。 A long [good] while 长久。 After a while 过了一会儿。 All the while 始终，一直。 At whiles 有时，时常。 Between whiles 时常，不时地。 Every little while ＝ at whiles. For a [one] while 暂时，一时。 In a little while 不久，没一会儿，立刻。 Make it worth sb.'s while 酬劳；行贿。 Once in a while 时常，有时。 The while [whilst] 1. 当时；其间，在那中间；同时。 2. 〔诗〕…当中〔此义常用 whilst〕。 Worth (sb.'s) while 有…的价值，值得；有利益的 (It is worth while to see the museum. 参观博物馆是有益的)。

连接词
1.当…的时候；和…同时。
2.而，但是，可是，倒，却，但另一方面，反过来；虽则。
He was drowned while swimming. 他游泳时淹死了。 While I like the colour of the hat, I do not like its shape. 我倒喜欢这顶帽子的颜色，但不喜欢那个式样。 One lost a leg, another an arm, while a third was killed outright. 一个人折了一只腿，一个人丢了一只胳膊，另一个人呢，当场死了。 At a time when … while … 一面…一面又…。