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
尽管其他很容易看出错误，但正确答案有一点迷惑，e中while performing specific jobs that benefit the public ， 按逻辑省的是they are, 但和句子主语（number)并不一致， 怎么可以省略？
还有一道题
1. The Wallerstein study indicates that even after a decade young men and women still experience some of the effects of a divorce occurring when a child.
(A) occurring when a child
(B) occurring when children
(C) that occurred when a child
(D) that occurred when they were children（D）
(E) that has occurred as each was a child
Choice A incorrectly introduces the when... phrase with occurring, thus illogically making divorce the grammatical referent of when a child;那么ets认为when, while省略的逻辑主语是最近的名词了?我明明记得上课时新东方说应该是主句主语的.
请教
个人认为performing实际和to remain对应，故performing specific jobs 逻辑主语是前面的them, 即convicted criminals 。
如果while是和主句的谓语相应，则省略的逻辑主语应如新东方所说应该是主句主语。
那么while 与那个动词对应全凭逻辑判断了，没有什么就近原则，和主句主语一致原则？
Choice A incorrectly introduces the when... phrase with occurring, thus illogically making divorce the grammatical referent of when a child
看1的解释， 似乎仍是就近原则
sentences allowing them to remain unconfined while performing specific jobs that benefit the public has分词短语中还有them to remain 所以这里while performing 省略的为当前动作的发出者。
occurring when a child（children)分词短语中没有其他动作，唯有向前寻找匹配到occurring，而这个动作就刚好是divorce发出，所以错误。
这样的解释应该可以吧。
为什么这里while没有修饰allow的歧义呢？
another question, are both ",which..." and "allowing..." correct to use here?
why?
是不是要从意思上理解呢？ETS可真奇怪。
判决可能跟法律法规一样喜欢跟分词作定语，因为后面还有主句得谓语，所以不能中间有逗号。
旧帖子也要挖出来了，
NN指教阿， E答案实在不是很理解；
In the last few years, the number of convicted criminals given community service sentences（判决） allowing them to remain unconfined while performing specific jobs that benefit the public has risen dramatically.
这里的while performing怎么看都不顺眼的。主语是什么？
中in their performing of 用得比较多余，又是名词形式又加入词，动词优于名词；which的指代比较麻烦，赵丽认为有which的时候一般是非限制性从句，即“有逗号有which，没有逗号没有which”。
(A) occurring when a child
(B) occurring when children
(C) that occurred when a child
(D) that occurred when they were children（D）
(E) that has occurred as each was a child
这个题考的是非谓语动词分词作定语，现在分词：多次重复性行为，定语从句：强调具体一次性行为。如果用occurring强调多次，排除。C是单数，E中用as,不过题中有4个都是用的when，1：4的情况一般可以排除。when, as, 引导时间状语从句时，侧重点有所不同:
1.when可指时间点，又可指时间段，从句中可用延续性动词，也可用非延续性动词。
2.as多用于平行结构，表示两个动作同时发生：一个主语同时进行两个动作；一种状态随另一种状态的变化而变化。
3.表示主句的动作发生在从句的较长动作过程中，when, as均可使用。从句中为be动词时，多用when。谈论两个平行动作或两种状态变化多用as。
4.从句和主句要表示一个人的两个动作交替进行或同时完成时，则多用as，可译为“一边......，一边......”。
5。表示从句的动作在主句的动作“之前”或“之后”发生时，多用when（=after）, 不用as或 while。
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