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) sentences allowing them to remain unconfined while performing specific jobs that benefit the public has（E）
我想问E中allowing的主语我的理解是sentences对吗?
更疑惑的是E在句中不用which allow而用allowing 不会有歧意吗?ETS有时候说which不能省，有没有什么判断的规则可以知道which要不要省略呢? 先谢谢了!
allowing是修饰sentece的。allowing分词，和which that都可以引导限定性定语从句（that不能引导非限定，ｗｈｉｃｈ可以引导非限定）。到底是用分词还是从句并没有绝对的判定法则。唯一确定的是，allowing修饰ｔｈｅ ｎｅａｒｅｓｔ ｎｏｕｎ，而ｔｈａｔ／ｗｈｉｃｈ有时可以跳跃修饰。
靠逻辑判断。
楼上已经说得很好了，补充一点点， D,
D. in their performing of :: 动名词
E. while they are performing
D. jobs beneficial to the public :: 抽象名词
E. jobs that benefit the public
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