请教OG 184的一道语法题，有个选项的语法没有看懂

vipraymond

184. As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as many companies have been unable to pass on higher costs.

(A)  and have slipped since then, as many companies have been unable to pass on higher costs

(B)  and have slipped since then, the reason being because many companies have been unable to pass on higher costs

(C)  and slipped since then, many companies being unable to pass on higher costs

(D)  but, many companies unable to pass on higher costs, they have slipped since then

(E)  yet are slipping since then, because many companies were unable to pass on higher costs

答案是A，我想问的是D选项，many companies unable to pass on higher costs， 这个插入语的语法是怎么回事？我觉得是不是前面应该加个as，变成 as many companies unable to pass on higher costs 才比较对呢？

lindberghya

as表达“随着”必须要跟句子吧，所以还要加上谓语。
而且前文说as measured.....后面跟的就是陈述的内容，用and来连接两个事情，最后加个伴随。这要好过but加插入语再接第二个事情。这里我个人觉得用but不是很信服。而且改变了原句只是要陈述profits如何变化的语境。

vipraymond

lindberghya 发表于 2013-12-2 14:45
as表达“随着”必须要跟句子吧，所以还要加上谓语。
而且前文说as measured.....后面跟的就是陈述的内容， ...

噢， 但是我觉得
many companies unable to pass on higher costs

这个插入语的存在不符合语法啊，它既不是同位语，也不是Ving 或者Ved这种形式，请问英文中有这样的语法吗

lindberghya

vipraymond 发表于 2013-12-5 18:58
噢， 但是我觉得
many companies unable to pass on higher costs

这个不是插入，many companies就是they的先行词啊，unable是修饰作用，其实就是an, many companies +修饰, they.....
只是起了个说明修饰的作用，没有语法问题

vipraymond

lindberghya 发表于 2013-12-7 05:10
这个不是插入，many companies就是they的先行词啊，unable是修饰作用，其实就是an, many companies +修饰 ...

不好意思啊，我还是不理解，
如果是先行词的话，这句话缺少类似which，that的引导词，所以还是不合逻辑啊。。。

能举个别的类似语法的句子吗？