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

The given answer is A.

I think the answer should be E. In A, "that" does not put in the proper position...

首先，E中的have the capability to do sth罗嗦，且习惯搭配好像是have the capability of doing sth（这个有待考证，只是依稀记得）。

A的that指代a new type of engine，没用错呀。这里其实是修饰成份后置了，杨鹏难句中有说，这就是其中一种难句：将过长的修饰成份后置，原句应该是：

A new type of engine that could。。。is being tested。