求教PREP2007，Practice 1,68题

williamqinc

For the best extraction of the flavor of saffron threads, it should be soaked in liquid after being
pounded with a mortar and pestle.
(A) For the best extraction of the flavor of saffron threads, it should be soaked in liquid after being
pounded
(B) To best extract their flavor, saffron threads should be soaked in liquid after pounding
(C) The best way to extract the flavor from saffron threads is soaking them in liquid after being
pounded
(D) The best way to extract the flavor from saffron threads is to soak them in liquid after pounding
them
(E) The flavor of saffron threads can best be extracted by soaking it in liquid after pounding it

语法笔记中说：(D)正确, the best way to extract… is to soak结构平行;

同时又给出另一道题：

One legacy of Madison Avenue's recent campaign to appeal to people fifty years old and over
is the realization that as a person ages. their concerns change as well.
(A) the realization that as a person ages, their
(B) the realization that as people age, their
(C) to realize that when a person ages, his or her
(D) to realize that when people age, their  
(E) realizing that as people age, their

并解释：
其中 C,D,E 选项均不满足 sth is sth 的平行对应. one legacy 是名词,因此和它对应的也应该是名词,而
C,D,E 分别是 to do 结构和动名词结构,不能和名词结构平行,因此排除 C,D,E 选项,然后根据指代一致,
排除 A,正确答案为 B

The best way to extract the flavor from saffron threads和One legacy of Madison Avenue's recent campaign to appeal to people fifty years old and over从语法结构上看，都是由不定式修饰的名词词组，为什么前者的对称形式是不定式但后者却是名词呢？

疑惑中……求大神赐教……