Since the 1930s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped...

题目信息

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.

A:wings, shaped so smoothly and perfectly

B:wings, wings so smooth and so perfectly shaped

C:wings that are shaped so smooth and perfect

D:wings, shaped in such a smooth and perfect manner

E:wings, wings having been shaped smoothly and perfectly so

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正确答案： B:wings, wings so smooth and so perfectly shaped

答案B
原句大意：自1930年代以来，飞机制造商一直试图制造具有无摩擦机翼的飞机，机翼的形状如此光滑、完美，以至于经过它们的空气不会形成乱流。
A.错误。句意不清晰，不能清楚判别是airplane还是wings被光滑制造。
B.正确。
C.错误。此处应使用副词而非形容词
D.错误，同A ，句意不清晰，不能清楚判别是airplane还是wings被光滑制造。
E.错误，having been错误地引入了完成时，但句子语态并不需要对时态的改动。

笔记