求助GWD第10套33题

vi花茶诺言

感觉GWD有些语法题答案给的实在很牵强，向各位大侠求助
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
E是正确答案，但could和have the capability to不是很wordy?

wangjieava23

这个不是A吗