请教小蓝上的几道语法题～～大家帮忙解决一下呗～～谢谢啦～～～

zhaolingoblin

1. One of every two new businesses fail within two years.
A. fail
B. fails
C. should fail
D. may have failed
E. has failed

这里的within teo years是过去的时间还是将来的时间呢？

2. Since the 1930's aircraft manufactures have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly ahat 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

难道不是应该用smoothly吗？

3. Several senior officials spoke to the press on condition that they not be named in the story.
A. that they not be named
B. that their names will not be used
C. that their names are not used
D. of not being named
E. they will not be named

这里是有虚拟语气吗？为什么会用到虚拟语气啊？

～～～还有一个问题：
one of + n.复数 + that 定语从句 verb 复数
the but one of + n.复数 + that 定语从句 verb 单数
但有些题中没有the, 仅仅是but one of + n.复数
那定语从句中的谓语动词使用单数还是复数啊？

ryanrui

第三题，我认为是虚拟，省略了should，但是如果我第一次做这个题，可能会错选b或c

ryanrui

同意楼上意见，
另外我补充下第二点：其实shaped不是v，整个是独立主格结构，即n＋adj的形式（n so adj and so adj）

windypig123

1.应该表示的是一个规律，所以用一般现在时，主语是单数。
2.那个smooth 是修饰wings 所以用形容词修饰名词的啊。smooth and shaped这2个并列 而perfectly修饰shaped
3.难道是On conditions that??这个后面要虚拟？？那个是如果的意思。。
4.那个是看but是做连词还是前面加了THE？？？