The peaks of a ing mountain range,acting like rocks in a streamed 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,is 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 OG说E不好是因为although从句用被动很awkward unclear。。。 诚然C中主动要更好些，但是C里 crests and troughs that remain stationary 却比E的stationary crests and troughs要简洁啊，这点OG为毛视而不见了呢。。。 请指教
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发表于 2011-8-15 10:59:33
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