SC 797 分词问题

小湖

797.    The original building and loan associations were organized as limited life funds, whose members made monthly payments on their share subscriptions, then taking turns drawing on the funds for home mortgages.
(A) subscriptions, then taking turns drawing
(B) subscriptions, and then taking turns drawing
(C) subscriptions and then took turns drawing
(D) subscriptions and then took turns, they drew
(E) subscriptions and then drew, taking turns


选C是选出来了，可是这个drawing的主语到底是哪个？我遇到分词老是糊涂。。。。。


谢谢

小湖

800.    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


这里E中的分词，establishing 和using答案说是修饰Athens，为什么不是修饰sltan？因为establishing前有个逗号吗