又一道想不通的GWD题

Q33:

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.

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

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

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

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

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

来看看这道题，答案给出的是E,可是could和have the capability我觉得是语意重复的，而且 have the capability也是一种比较罗嗦的表达方式，我觉得A更合适一点，谁能帮我解释一下为什么选E吗？

that 的修饰对象问题，是做test的宾语，还是做整句的状语部分。A没分清楚

could和have capability这里应该是不重复的，一个是可能性，一个是有能力。

have the capability可能啰嗦，但是这是应试，选对的答案，不是找最完美的. over