我會以 misplaced modifier/改變句意 去解釋 (E)把 crests and troughs that ramain stationary 變成 stationary crests and troughs 這意思就不同了 (C)就是對的 因為只是把subject/verb 對照上了 文意沒變 OG的解釋有時候.....會越看越"花" 個人淺見 有不對的話可以在討論摟~ ※ 引述《ken22154 (人生=循環)》之銘言： : 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.” : (C) crests and troughs that remain stationary although the air that forms : them is moving rapidly, is : (E) stationary crests and troughs although they are formed by rapidly moving : air, is : 答案是C，我選E : 但我看不懂OG的解釋，有誰可以指點迷津嗎？ : 或是指出我選E的錯誤～ : Choice E uses the correct verb form, is, but it incorrectly introduces a : dependent adverbial although clause into a prepositional phrase (with : crests...). : In the textbook publishing business, the second quarter is historically : weak, because revenues are (low and marketing expenses are high as companies : prepare) for the coming school year. : 此題原句即是正確答案。而我的疑問是，兩個獨立子句用連結詞連結， : 不是應該中間要加逗點嗎？ 所以我覺得and前應該要加逗點 : 還是我的認知有錯誤？ : 感謝解答～ --

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