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

key E

请问a为什么不对？

另外E中have the capability to 不如could 简洁阿？

I agree with nbnhjf on that point.

Besides, I think "can" should be used instead of "could". "Could" doesn't agree with the tense of the main clause which is indicated by "is".