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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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C 选项里：wings that are shaped so smooth and perfect ，里面smooth 和 perfect 都是用来修饰shaped 而不是wings 的。副词修饰动词，smooth 可以做形容词和副词，但是perfect只做形容词，错了。应用smooth and perfectly 更合适
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