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Since the 1930s aircraft manufacturers have tried to buil [#permalink]
17 Dec 2004, 07:09
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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
I agree with you that it should be smoothly. But I i feel like since it is between (B) and (E) (since those are the only two dependent clauses introduced with a subject or pronoun) and that (B) is a more correct answer than (E).......that is the best reason that I can come up with....