请教OG 114 和OG 184里面yet的用法

cicilla

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

(E)   baggage yet was so light    答案E

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   答案A

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

ETS解释184的E的时候说在yet前面需要一个逗号隔开。有人也总结说yet, but这样表示转折的连词连接同一个主语的两个谓语也要用逗号隔开，这一点和and是不一样的。

可是114的yet连接的就是canoe这个主语发出的两个动作：could和was，为什么没有用逗号呢？

谢谢！！

lilyzy

看一下前辈的贴子, 见第10楼.

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=63237

cicilla

thanks. 也就是说yet和and一样！