TT语法问题，谢谢大家！

terry_tin

GMAT语法补充资料;
No.192
Trying to learn some of the basis of programming is (the same as to tinker with a car when one is a teenager): some people end up to going to engineering school, and others, twenty years later, remember nothing of the experience.
A. the same as to tinker with a car when one is a teenager
B. similar to a teenager tinkering with a car
C. like tinkering with a car as a teenager
D. the same as a teenager tinkering with a car
E. like the teenager's tinkering with a car

The answer is A. while i choose B. What is the error in B?为什么不是Trying to do ...is doing sth?
No. 191
(A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients,) is cultivated in China as part of a program to integrate traditional herbal medicine into a comtemporary system of health care.
A. A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients,
B. A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle
C. A Madagascar priwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients
D. The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that
E. The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients.
Anwser: E.
终于打完了，这个题看得我真是晕啊！改错部分后面的句子的主语难道不是A substance吗？选项E不是改变了原句的主语吗？
请高手指点

1stzhang

1、由不定式构成的平行结构。A答案省略了trying ，B的问题是构成不了平行结构

2、这个题目只考了一个动词的合理的发出。cultivate “耕作，培养”只能用于植物，其他四个答案的动词的发出者都不对。

提醒tt sis 一句，做题的时候要把注意力集中在句子的主干上，先看主要的动词，再看其他的动词，以动词为核心解题。

joywzy

以下是引用1stzhang在2003-5-9 17:40:00的发言：
2、这个题目只考了一个动词的合理的发出。cultivate “耕作，培养”只能用于植物，其他四个答案的动词的发出者都不对。
  
提醒tt sis 一句，做题的时候要把注意力集中在句子的主干上，先看主要的动词，再看其他的动词，以动词为核心解题。

说得好啊!真是佩服!!!

terry_tin

嗯，受益匪浅。谢了，下次做题的时候一定会注意你说的问题！
厉害厉害～