求大神指点！！！语法题目。

Daisy德德

这本书有好多不会，求各位大神帮忙!

1. The sale of government surplus machinery will begin at 9 a.m. and continue until the supply lasts.
A. will begin at 9 a.m. and continue until the supply lasts
B. begins at 9 a.m. and, until the supply lasts, will continue
C. will begin at 9 a.m. and, until the supply lasts, will continue
D. begins at 9a.m. and, as long as the supply may last, it continues
E. will begin at 9a.m. and continue as long as the supply lasts

这题答案是E， 我选了C，and 不是要前后对称么？

2.  In the United States, trade unions encountered far more intense opposition against their struggle for social legitimacy than the organized labor movements of most other democratic nations.A. against their struggle for social legitimacy than
B. in their struggle for social legitimacy than did
C. against their stuggle for social legitimacy as
D. in their straggle for social legitimacy as did
E. when they strggled for social legitimacy than has

答案是B，真心不懂那个did。。。

3. Since 1970 the number of Blacks elected to state and federal offices in the United States has multiplied nearly four times.
A, has multipied nearly four times
B. has almost quadrupled
C. has almost multiplied by four
D. is almost four times as great
E. is nearly fourfold what it was

答案是B。为什么呢？

谢谢各位大神！！！

Nancy0c

非牛，语法不好，试解答
第1题
until后面应该是个时间点，last很明显是个延续性动作
至于你说的and前后平行，我以前也有疑惑，但是做题中见过好多will do and do的句型，应该是do and do就是平行结构了吧。如果还是有困惑可以去看MANHATTAN平行那章
第2题
没划线不想看
第3题
multiple本身就有倍数的意思，再用quadruple肯定是重复了
quadruple本身就有变4倍的意思。LZ可以回去翻PREP 08语法笔记，里面有很详细的解释

顺便说下楼主以后遇到语法问题可以先把题目拿去GOOGLE。一般会出来CD\MANHATTANCLUB\GMATCLUB的解答，这三个网站的解答最值得看。后面两个是老外的网站哈，但是考GMAT的一般都应该看懂吧。直接在CD发帖很容易沉的哟。

Daisy德德

Nancy0c 发表于 2013-5-2 11:19
非牛，语法不好，试解答
第1题
until后面应该是个时间点，last很明显是个延续性动作

哇。谢谢！！！

kiwifoodtown

非牛，面对基础语法题目，也试着解答，
1，will do ...and do...  是do...and do.....平行。

2，比较状语从句结构中，通常会用倒装。

3，quadrupled 四倍，用法最简洁明了。