OG 205 想到的一类问题

205. 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

看过前人的讨论，没有涉及这个问题，所以向大家请教！前半句中的acting like rocks in a streambed，是否存在夹心的问题呢？如果没有，什么样的情况才是夹心呢？是否这种现在分词形式放在句子中间都不太好呢？谢谢！

一看你的题我就糊涂了，还真没想过这个问题呢，

又顺带查了ACT的用法，又忘记了，记性真差。

ACT LIKE 举止行为像----

ACT AS 充当，起作用。

关于这个分词的逻辑主语前后修饰的问题，我想这一题是没有歧义的，因为向前修饰的话，逻辑主语是The peaks of a mountain range，向后修饰的话，修饰后面的动词produces ,那么逻辑主语就是动词produce 的逻辑主语，仍然是The peaks of a mountain range，至于什么时候夹心，我觉得两个分词连在一起不好，但是主谓之间有个分词应该是作插入语吧，

也不是很确定，供参考，

一起等解答。呵呵。

感觉如果ing是在两个名词之间，那就不是很好了。但其他情况怎么确定夹心，仅通过逻辑关系吗？继续求助

所以就是说没有形式上绝对正确与错误，只有逻辑意思上合理与歧义了？