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
The main challenge in this sentence is to observe the agreement of subject and verb (the resulting flow pattern... is known...) despite the distraction of a complex
intervening structure containing several plural elements (with crests and troughs...). Choices A, B, and D can, therefore, be eliminated because they use an incorrect
plural verb form, are.
Choice E uses the correct verb form, is,
but it incorrectly introduces a dependent adverbial although clause into a
prepositional phrase (with crests ...). Choice D also makes this error. Such dependent clauses can only occur in the
predicates of full clauses. C, the best choice, uses the correct verb form, is,
and correctly puts the although clause inside the
predicate of the relative clause (that...rapidly).
请各位牛牛帮忙，我对蓝色字体的意思不是太明白，不知有哪位可以帮我解释下？
另外，Although 作为让步状语从句有没有说明该从句一定要有主谓宾？不然就错？
谢谢！
汗, 俺也选错了.
with型独立主格: with + n. + -ed/-ing with + n. +adj. with + n. +介词短语
所以E错了.
OG11有说although引导从句要主谓齐全
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