GMAT语法题请教1.【Japan received huge sums of capital from the Uni

GMAT语法题请教
1.【Japan received huge sums of capital from the United States after the Second
World War,using it to help build】 amodern industrial system.
【划线部分】
A) Japan received huge sums of capital from the United States after the
Second World War,using it to help build
B) Japan received huge sums of capital from the United States after the
Second World War and used it to help in building
C) Japan used the huge sums of capital it received from the United States
after the Second World War to help build
D) Japan’s huge sums of capital received from the United States after the
Second World War were used to help it in building
E) Receiving huge sums of capital from the United States after the Second
World War,Japan used it to help build
正解C,我选了A……不知道A错在哪里……有人说这道题是代词考点,可是A和C都是只有一个代词,都可以指代capital的吧……
2.At a recent session,the French government 【has decided that Paris needs】 a second,larger opera house to complement the famous Paris Opera.
(A) has decided that Paris needs
(B) decided that Paris needs
正解B……我选了A……我觉得原文时态没有很明显的错误啊为什么要改?
3.Although it was expected that workers under forty would show hostility to the plan,the research report indicates that both 【younger and the older people】 approve of governmental appropriations for Social Security.
(A) younger and the older people
(B) younger people and the older
(C) the younger and the older people
(D) younger and older people
(E) people who are younger and those who are older
正解D,我选了C……不懂这两个有什么差?

1、a的歧义在于在gmat中,这样的表述指的是the Second World War 来using
2、at是一个时点,原句是一段时间,所以不一样
3、the是特指,这里明显是通过一个调查然后得出一个泛泛的年轻人和老人怎么怎么样.
gmat考试不能只抠语法,句义准确到变态的表达为主,语法规则为辅助.
再问： 1、为什么是表示the Second World War 来using？不是应该是主句主语来做状语的逻辑主语吗？ 2、完成时不能用有时间点的词是吗?
再答： 1或者你拿a,c做比较，主要区别在于it，代词通常指主语，所以应该指Japan,但是a指capital 2,是