After more than four decades of research and development, a new type of jet engine is being tested that could eventually propel aircraft anywhere in the world within two hours or help boost cargoes into space at significantly lower costs than current methods permit.


tested that could eventually propel aircraft anywhere in the world within two hours or help

tested that could eventually have the capability of propelling aircraft anywhere in the world within two hours or to help

tested, eventually able to propel aircraft anywhere in the world within two hours, or helping

tested, and it eventually could propel aircraft anywhere in the world within two hours or helping

tested, and it could eventually have the capability to propel aircraft anywhere in the world within two hours or help

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考题讲解

题目分析：
本题需要先看出一个倒装的情况。tested身后的that could eventually propel aircraft anywhere in the world within two hours其实是名词a new type of jet engine的限制性定语从句。倒装的原因，主要是因为谓语动词太短了，主语再加上这个定语从句后会显得很长，容易让读者看不到主干。

选项分析：

A选项：Correct. 本选项在语法和逻辑上均是正确的。

B选项：选项最后的平行有误。新型的喷气的发动机能干两件事，一件事是把飞行器两小时内推到地球的任何一个地方（could eventually propel aircraft anywhere in the world within two hours），另一件事是它可以帮助把这个货物推进太空（could help boost cargoes into space at significantly lower costs than current methods permit）。两者应该保证平行。

C选项：平行错误同选项(B)。

D选项：首先，and将test句和propel句变成了“合句”。合句表示前后两句没有什么逻辑关系，是完全并列平行的。但是在逻辑上，推到任何一个地方和推进太空均应该是这个正在被试验的飞行器的特点，因此应该让propel句做飞行器的定语，修饰以及描述这个飞行器的特点。其次，平行错误同选项(B)。

E选项：合句逻辑关系错误同选项(D)。

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