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题库 / GMATAdvanced-SC-12
Since the 1930s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.
wings, shaped so smoothly and perfectly
wings, wings so smooth and so perfectly shaped
wings that are shaped so smooth and perfect
wings, shaped in such a smooth and perfect manner
wings, wings having been shaped smoothly and perfectly so
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同位语的四种形式：名词以及短语（有时有逗号分开）、动名词短语（有逗号分开）、不定式短语（有时有逗号隔开）、形容词及其短语（有逗号隔开）
B选项中 后一个wings表示同位语，其后为定语从句，省略主语和谓语。整体用于解释wings的属性
smooth形容翼型的顺滑，perfectly形容be shaped，表明形状被设计的很完美
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