同理:不清楚题目出处

Since the 1930's aircraft manufactures 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

    答案为什么　是b啊？

恳请楼主修改标题，给出题目出处，多次提醒您了。

如果一直这样发贴，大家回帖也不方便，您查询也不方便，严重影响您的复习备考。

GMAT语法区版规
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830

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谢谢

完全同意！

给出题目出处会惠及后人，功德无量。

这是主谓搭配问题,wings可以用smooth来形容,但是不能shaped prefectly,只能是被动

这样解释明白么?

还有解释没太明白.....mm.

    还能说详细点不?

怎么会不知道题目出处呢?

题目无非是从书上,或网上资料来