The auto company attributed its recent increase in profits to both its introduction of new models in North America that are less expensive in their manufacture and to success in making its factories more efficient.


to both its introduction of new models in North America that are less expensive in their manufacture and to success in

to both its introduction of new models in North America that are less expensive in manufacturing and success in its

to both its introducing new models in North America that are less expensive in manufacturing and to success in

both to its introduction of new models in North America that are less expensive to manufacture and to success in

both to its introducing new models in North America that are less expensive in their manufacturing and to success in its

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题目分析：
划线部分中出现了平行触发语both...and...，其连接的两者需要保持形式上的平行。

选项分析：

A选项：平行触发语both...and...连接两者不平行。复数代词their只能指代复数名词，但能发出manufacture这个动作的是The auto company（公司），是一个单数名词。

B选项：代词its是赘余的。success in its making its factories more efficient中两个its之中有一个是赘余的。

C选项：平行触发语both...and...连接两者不平行。

D选项：Correct. 本选项在语法和逻辑上均是正确的。

E选项：复数代词their只能指代复数名词，但能发出manufacture这个动作的是The auto company（公司），是一个单数名词。

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Prep2012-SC
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