1. 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 he air that forms them is moving rapidly, are（C）
(E) stationary crests and troughs although they are formed by rapidly moving air, is
答案C没有问题，但是我觉得E也没错的，有什么错么？
主动优先原则吧，个人感觉．Ｅ有点繁琐．
E是有点繁。
og的原解说E中的although有问题，但我不知道问题是什么。。。还请大家帮忙解释一下！
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