205. The peaks of a mountain range, acting like rocks in a streambed, produce ripples（波纹） 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
答案是C
我的问题是如果B项are改成is，也就是改成crests and troughs that remian stationary although they are formed by rapidly moving air, is对不对呢？
主动优于被动，改了也不好
SC要比较选项差异寻找最佳答案，个人认为还是就题目出发，不要想改了哪个选项会怎样，不能按自己的猜测，需要遵循GMAT思路
嗯同意主动优于被动，另外涉及到“they”这些表示指代的词要留意有没有指代错误，我经常吃这亏.
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