capability of/to? - ChaseDream - Powered by Discuz!

这个其实有人讨论过但是翻遍所有讨论贴没有定论，请教一个问题：

如果后者是错的，下面一题E就坚决不可能了。（此题悬在A/E之间），请指教了..

Q6:

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

我找到的所有相关此题的讨论：（此题讨论已经不少，我还要单发贴，是只想单独看一个语法点，请斑竹原谅）