OG184和114的对比

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

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

OG解释在DE的BUT 和YET之前要加逗号

114. From the bark of the paper birch tree the Menomini crafted a canoe about twenty feet long and two feet wide, with small ribs and rails of cedar, which could carry four persons or eight hundred pounds of baggage so light that a person could easily portage it around impeding rapids.

(A)baggage so light

(B)baggage being so light

(C)baggage, yet being so light

(D)baggage, and so light

baggage yet was so light

这里的E没加逗号

对比这两题，我得出这样的结论，大家看看对不对：BUT、YET引入一个完全独立的从句就必须在它们的前面加逗号隔开，如果不是完全独立的句子，就不用逗号。对不对啊？

是不是要把大全下载后对应才行啊?我不知道怎么用,只是输入OG184或OG114,没找到,求救pumpkin美女.

你直接搜索yet,有篇braveMBA 的文章

看了之前的NN的解答，真是惭愧，自己就没有注意到这个问题~~

前面julvo大侠的精彩解释相当有道理，不过我还有一点点补充。comma的用法，本质上是为了制造语气上的停顿。and和yet从语法上，都没有强制要求前面或者后面有comma，那么comma的使用很大程度就取决于句子本身通顺的需要；184的D和E两个选项，在朗读的时候，but和yet要读成升调，这样就要求前面有一个必然的停顿，因此需要一个逗号；而前面的and则不然，and会读轻，而且从corporate...开始就下降。而114，后面有一个so light，可以用来提升和拉长语气，所以yet前的comma看上去更可有可无些，而且如julvo大牛指出的，一个comma带来大量的歧义。

以上纯属个人看法，如有不妥，请大牛们指正！

(A)  low and marketing expenses are high as companies prepare

(B)   low and their marketing expenses are high as they prepare

(C)  low with higher marketing expenses in preparation

(D)  low, while marketing expenses are higher to prepare

(E)   low, while their marketing expenses are higher in preparation

为了避免, and marketing expenses are high as companies prepare脱离because的笼罩,

所以就不得不取消逗号-一切为了大骨架结构的完美对称和意思的完美平行......

是吧，NN们，如果这个理解正确，我就解开了OG里面关于逗号的疑问了，NN们路过的发表一下看发。