再问OG12-95

bryant_yc

95. The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as “standing waves.”
(A) crests and troughs that remain stationary although the air that forms them is  moving rapidly, are
(B) crests and troughs that remain stationary although they are formed by rapidly moving
air, are
(C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is
(D) stationary crests and troughs although the air that forms them is moving rapidly, are
(E) stationary crests and troughs although they are formed by rapidly moving air, is


正确答案是C      我的疑问在于E为什么错。
OG的解释是:
E. The subordinate clause in the passive voice following although is awkward and unclear


看了以前关于这道题的讨论，感觉还是没有一个很确切的解释...
个人感觉E项的问题可能出在although 的使用上...  
请路过NN解答！！！

bryant_yc

up~~  请解答