大全sec 13 , 7 答案对吗

Since the 1930’s 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

大家认为应该选什么呀？我认为C对， that后的部分修饰n. wings

可答案却是B! B是什么结构呀？搞不懂啊...

According to the context, logically, " so smooth" should modify "wings", we can't say" wings shaped so smoothly". therefore, only B met.

But I don't know what's part "wings so smooth and so perfectly shaped.." here act as,please NN help to crack it. thanks/

有道理，所以现在我也觉得C不对了，是不是如果改成” wings that are so smooth and so perfectly shaped" 就对了。

可是B的结构还是分析不清，哪位大侠知道呀。求助！