phoebelulu: 本题A虽然读起来不爽,但是没有致命错误,个人意见: 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.其中的is being tested是倒装,因为that从句的修饰部分太长了,所以is being tested提前了。 E的致命错误除了could和have ability重复之外,capability的用法是,capability of doing,没有to do的用法,这个是肯定了,相信所有的语法书里都是一样的。 所以,E绝对不能是答案。
太牛了,这都能看出来 |