介词后面可以跟 名词 / 代词 / -ing, 但不能跟 n.+-ing / 句子
介词后面可以跟 名词 / 代词 / -ing, 但不能跟 n.+-ing / 句子
介词后面不可以跟从句, 但如果从句修饰的是介词后面的名词, 就可以.
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 (C)
(E) stationary crests and troughs although they are formed by rapidly moving air, is
Choice E uses the correct verb form, is, but it incorrectly introduces a dependent adverbial although clause into a prepositional phrase (with crests ...). 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).
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