语法求助

小弟涉G未深.这两天用了杨鹏的"集中突破法"来突破语法.效果不错.不过有几道题目苦思苦想了很久.不得其解.请各位大俠指点.

Q1

OFFICIAL GUID.  AGE 672

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

排除其他干扰选项,还剩下B 和C:

B) for the paychecks of their employees who have been assigned

C) for the paychecks of their employees,  having been assigned

小弟选了C.我记得老师讲到的一个优选法. 分词优选于从句.

但是正确答案却是B)??

Q2

OFFICIAL GUIDE. P675 QUESTION 149

Last year, land values in most parts of the pinelands rose almost so fast, and in some parts even faster than what they did outside the pinelands.

两个干扰选项:

D) as fast as, and in some parts even faster than, those

E) as fast as, and in some parts even faster than what they did

正确答案是选D).但是不是说在比较结构中,FASTER THAN 和后面的比较物当中不应该有逗号的?

因为这个小小疑问,我选了错误选项E)

最让我疑惑的是OFFICIAL GUIDE 上PAGE 694. Q261

Being a United States citizen since 1988 and born in Calcutta in 1940, author Bharati Mukherjee has lived in England and Canada, and first came to the United States in 1961 to study at the Iowa Writers' Workshop.

正确答案为C)

A) Being a United States citizen since 1988 and born in Calcutta in 1940, author Bharati Mukeherjee has

B) Having been a United States citizen since 1988, she was born in Calcutta in 1940; author Bharati Mukherjee

C) Born in Calcutta in 1940, author Bharati Mukherjee became a United States citizen in 1988; she has

正确答案为C). 我也觉得B不好.但是还是选了它.因为它用的过去事态,和后面句中CAME正好保持一致.而正确答案C中却用了现在完成事态.我记得老师说过现在事态是不可以和过去事态混用的.

就以上三道.谢谢各位的时间投入.小弟感激不尽.

最近也在准备语法，水平也不匝地，发表个人见解，让牛人见笑啦。

1）分词简洁，但有个前提，就是逻辑主语没有问题。这道题目逻辑主语不明确，用分词容易产生歧义。故不能选。

2）E的they指代有问题，而且what they did 罗嗦，不如those简洁。和逗号没关系，并且这里必须用逗号，是插入语。

3）B的修饰有问题，逻辑意思有问题，意思是她出生的时候，已经是米国人了；而且后面的没有has 不对。你们老师教的现在完成和过去时不能一起用是有问题的，以OG为准。