[求助]新prep 2-189

189.      (31681-!-item-!-188;#058&006516)         (GWD3-Q30)

Today’s
technology allows manufacturers to make small cars more fuel-efficient now
than at any time in their production history.

A.
small cars more fuel-efficient now than at any time in their

B.
small cars that are more fuel-efficient than they were at any time in their

C.
small cars that are more fuel-efficient than those at any other time in

D.
more fuel-efficient small cars than those at any other time in their

E.
more fuel-efficient small cars now than at any time in

请大侠各个分析一下好吗，谢！

把自己的学习贡献如下：

（主要来源于 如下链接：http://www.manhattangmat.com/forums/post31835.html#p31835）

本题主要考代词指代的问题：

GMAT考试中有很多的代词指代歧义的问题，换句话说，比较理想的选项是只有一个关系代词的先行词的选项！要虔诚地遵循这个原则，去除掉任何技术上可能指代更多名词的选项。“要么有唯一可能的代词指代先行词，要么排除”

A：their 可能指代cars 也可能指代manufacturers

B：they 和 their同样有A中的问题

C: those只能指人，不能指物，所以，只能指代cars，不会有歧义指代manufacturers，正确。

D：their问题同A,B

E：对比对象不对等：more后面的的" fuel-efficient small cars" 跟than后面的"at any time“ 对比元素不对等，不具有可比性，排除。