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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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主句结构是： manufacturers（主语） have tried to build（谓语） airplanes （宾语）with frictionless wings（宾语补充），理论上如果后面要用, shaped...的话，Shaped的动作发出者要么是是manufacturers,要么是airplanes，然而题目是想说wings, 所以一定要加wings或That从句以免引起歧义，只能选BC，而C里面perfect要用副词形式
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