大全952

wokey

952.    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 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

答案是A

我的问题是A和B项里面那个that是干什么呢
分析来看它应该是在修饰jet engine,可是它的位置实在奇怪。可以中间插着“is being tested” 这么说么？

之前的帖子一直没说清楚，想再问问，请高人解答

yhwut

that修饰jet engine的，作定语

wokey

恩，是修饰jet engine没错，就是不知道能否中间插入“is being tested”这样的表达。

我想知道这算是什么语法现象