Q6
After more than fout decades og research and development,a new type of jet engine is being [u]tested that could eventually propel aircraft anywhere in the world within two hours or help[/u] boost cargoes into space at significantly lower cost 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 propeling aircraft anywhere in the world within two hours or to help
C.tested,evnetually 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
答案是E
可是我選A 以平衡來說 我無法了解這題耶><