OG178,OG233

178. In the last few years, the number of convicted criminals given community service sentences, which allow the criminals to remain unconfined while they perform specific jobs benefiting the public, have risen dramatically.

(A) sentences, which allow the criminals to remain unconfined while they perform specific jobs benefiting the public, have

(B) sentences, performing specific jobs that benefit the public while being allowed to remain unconfined, have

(C) sentences, performing specific jobs beneficial to the public while they are allowed to remain unconfined, have

(D) sentences which allow them to remain unconfined in their performing of specific jobs beneficial to the public has（E）

(E) sentences allowing them to remain unconfined while performing specific jobs that benefit the public has

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（C）

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

"WHILE DOING" 在这二题中, "doing"的主语在233是主句主语,在178却是最近的代词"them"不是主句主语, 请问各位ggjj,这种结构"doing"的主语有规律可寻吗?

先谢啦.

While 前后是对比.

关键还是要搞清题意.

是吗?

版主在哪里啊?没几天就要考了呀

178. In the last few years, the number of convicted criminals given community service sentences, which allow the criminals to remain unconfined while they perform specific jobs benefiting the public, have risen dramatically.

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.

(C) and fatigue among shift workers while raising

我在想while doing 是不是可以这样解释：向前寻找离其最近的动词，doing的动作发出者也就是这个动词的动作发出者。

以下是引用nicedreamer在2004-10-20 7:47:00的发言：
大彻大悟.

大彻大悟在哪里？