关于分词的重要问题，请教

127. In theory, international civil servants at the United Nations are prohibited from continuing to draw salaries from their own governments; in practice, however, some governments merely substitute living allowances for their employees' paychecks，assigned by them to the United Nations.
(A) for their employees' paychecks, assigned by them
(B) for the paychecks of their employees who have been assigned
(C) for the paychecks of their employees, having been assigned
(D) in place of their employees' paychecks, for those of them assigned
(E) in place of the paychecks of their employees to have been assigned by them
In choice A, the phrase assigned by them modifies the adjacent noun, paychecks: the sentence implies that paychecks, rather than employees, work at the United Nations. In C, the phrase having been assigned... is uncertain in reference, making the sentence unclear. By using in place of instead of for, j choices D and E create the unidiomatic and redundant construction substitutes x in place of y. Moreover, D, aside from being wordy, is unclear because the pronoun them has no unambiguous antecedent; and in E, their employees to have been assigned by them is wordy and awkward. Choice B, the best answer, properly uses the phrase who have been assigned... to the United Nations to modify employees.
120. The Parthenon was a church from 1204 until 1456, when Athens was taken by General Mohammed the Conqueror, the Turkish sultan, who established a mosque in the building and used the Acropolis as a fortress.
(A) who established a mosque in the building and used the Acropolis as
(B) who, establishing a mosque in the building, used the Acropolis like
(C) who, when he had established a mosque in the building, used the Acropolis like
(D) who had established a mosque in the building, using the Acropolis to be
(E) establishing a mosque in the building and using the Acropolis as
Choice A, the best answer, correctly supplies the past tense verbs established and used to describe two actions performed in 1456; also, it idiomatically employs the phrase used the Acropolis as a fortress, in which used as means "employed in the capacity of." Choices B and C incorrectly replace as wiui like. Furthermore, in C, when he had established a mosque distorts the intended meaning by stating that the first action was completed before the second was begun. Similarly, in D, had established... using states that Mohammed had already performed the actions before capturing Athens; and in E, establishing and using modify Athens, thus producing an absurd statement. In addition, D includes the unidiomatic construction "using x to be y."
ｏｇ的解释好像不一致，分词的修饰问题，高人指点一下。

我的看法是：有逗号分隔，应该修饰句子的主语

　　　　　　无逗号，修饰前面的名词。

高人指点

偶不是高人.探讨.

OG的解释好像(也应该)没问题. 我以前也有过类似的总结:有逗号分隔，应该修饰句子的主语;无逗号，修饰前面的名词.但这只限于现在分词放在句中或句尾表伴随这种情况. A do something1, doing something2(doing动作发出者为A,表伴随.). 而A do something1 doing something2(doing动作发出者为something1).而对于过去分词要看它在句中位置,在句首做状语动作发出者为主句主语.其他为定语.

不知对否???