D项中我认为including many idiosyncrasies of behavior逻辑上应该修饰striking similarities，放在这里的话就应该表伴随修饰句子主语identical twins了么？我的理解哪里出错了？
69.Many investors base their choice between bonds and stocks on comparing bond yields to the dividends available on common stocks.
(A) between bonds and stocks on comparing bond yields to
(B) among bonds and stocks on comparisons of bond yields to
(C) between bonds and stocks on comparisons of bond yields with（C）
(D) among bonds and stocks on comparing bond yields and
(E) between bonds and stocks on comparing bond yields with
我的问题是E选项为什么不可以，上来看见comparison直接就把BC排除了
83.At the time of the Mexican agrarian revolution, the most radical faction, that of Zapata and his followers, proposed a return to communal ownership of land, to what had been a pre-Columbian form of ownership respected by the Spaniards.
(A) land, to what had been a pre-Columbian form of ownership respected by the Spaniards.
(B) land, a form of ownership of the pre-Columbians and respected by the Spaniards.
(C) land, respected by the Spaniards and a pre-Columbian form of ownership.
(D) land in which a pre-Columbian form of ownership was respected by the Spaniards.
(E) land that had been a pre-Columbian form of ownership respected by the Spaniards.
答案是A，不明白A选项land后面的to what......到底做什么成分，当初看见B中的a form of......是个宾语同位语直接就选了