几道语法题目，希望高人指点～～手敲进去的，不容易啊～～看来要做电子版的了

新东方蓝书

Section 23-P213-16

Unlike the Shlites, who constitute the other major branch of Islan, the Sunnites do not await the Mahdi as a messenger from God, nor do they endow him with divine qualities or immunity from failure in judgement.

1. nor do they endow him
2. but they do not endow him
3. neither do they endow him
4. and they neither endow him
5. while endowing him neither

我选了C，
                答案是A。查了WEBSTER字典，否定倒装neither = nor。求解释。

Section 23-P214-18

Where once the union had acquiesced to the prejudices of its English-speaking members by supporting the imposition of an alien tax on immigrant workers, after 1897 the United Mine Workers made a determined effort to enlist Italians and Slavs in its ranks.

1. same as above

C.  While once the union had acquiesced to the prejudices of its English-speaking members in support of       

我选了C，
                答案是A。虽然supporting的确比in support of好，但where到底引导了什么意思。求解释。

Section 24-P215-2

In the last ten years, the dropout rate among Black high school students fell substantially over the past decade, while the number of Blacks who attend college is more than twice what it was.

C.  has fallen substantially, while the number of Blacks attending college has more than doubled

5. has fallen substantially over the past decade, while the number of Blacks who are attending college are more than double what they were

我选了C，答案是E。over the past decade难道不是和in the last ten years语意重复么，另外the number of怎么能用are？求解释。

Section 24-P217-7

Violence in the stands at soccer matches has gotten so pronounced in several European countries that some stadiums have adopted new rules that aim to identify fans of visiting teams and that seat them in a separate area.

B.  to identify fans of visiting teams and seat them

4. at identifying fans of visiting teams so as to seat them

我选了D，答案是B。aim除了aim at 还有aim to?如果有aim to, D又错在哪里。求解释。

Section 24-P222-22

Since the movie was released, seventeen UFOs have been sighted in the state which is more than had been sighted in the past the years together.

1. same as above
2. more than had been sighted

我选了A，答案是B。which（前面没逗号）为什么不能作非限制性定从修饰seventeen呢。如果是B，前面也应该有个逗号吧。求解释。

自己沙发一下，等回复中～～

请问大全987是什么东东？

指导一下新人如我吧～～虽然知道这种问题或许很弱智

1. I prefer C too

2. Where once = because, it's a habit usage

3. I prefer C too

4. aim to do sth., it's a habit usage. There are 2 expressions, both are correct, they are: aim (n. or verb) to do sth, or the rule aimed (v.ed) at/for doing sth

5. The subject of this setence is UFOs (pluriel), that's why A is not correct. The complete setence should be: 17 UFOs are more than (UFOs) which had been sighted, therefore UFOs are omitted.