GWD21-1

According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive Internet data over regular telephone lines with speeds much higher than is currently possible.

A.        with speeds much higher than is

B.        with speeds that are much higher than are

C.       at much higher speeds as are

D.       at much higher speeds than that

E.        at speeds much higher than are

答案是E.补全了就是at speeds much higher than (speeds)are
                currently possible.我的问题是: 1,比较双方 要求要对等,这里省略了主语speeds,但是谓动词are是对应的前面什么?

2,把D改成at much higher speeds than those对吗?

According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive Internet data over regular telephone lines with speeds much higher than is currently possible.

A.        with speeds much higher than is

B.        with speeds that are much higher than are

C.       at much higher speeds as are

D.       at much higher speeds than that

E.        at speeds much higher than are

答案是E.补全了就是at speeds much higher than (speeds)are
    currently possible.我的问题是: 1,比较双方 要求要对等,这里省略了主语speeds,但是谓动词are是对应的前面什么?

我的理解是

at speeds （which are）much higher than （speeds）are currently possible

2,把D改成at much higher speeds than those对吗?

感觉不对，those指代了higher speeds，还原后是这样的，at much higher speeds than higher speeds currently possible

应该是at speeds much higher than speeds are currently possible

这道题和prep 46有几分相似，但为什么prep46里就是用that，而这里要用are呢？是不是改为those更好？？

46.  If current trends continue, by the year 2010 carbon emissions in the United States
    will soar to a level more than one-third higher than were those in 1990, according to official projections.

A.     will soar to a level more than one-third higher than were those

B.     will soar to a level more than one-third higher than that

C.     would soar to a level more than one-third higher than is was

D.     would soar to a level more than one-third higher than those

E.      would soar to a level more than one-third higher than they were

A: a level higher than were those， those were 和a level不对称

B: correct，that指代a level

C: would 应该是will

D: 同上

E: 同上

 注意：

 注意：

1、if A do，B will do；if A did, B would do

2、a level higher than that in 1999

答案是B，呼喊牛人！！！

今天分别做了这两道题目-都错了，相当纳闷。为什么GWD21-1要用"are"呢，都不知道和前面的什么对应！？

Prep-46也做错了，原来后面的"that"指代前面的level，晕~~~

2,把D改成at much higher speeds than those对吗?

是对的those possible

possible可以做后置定语

以下纯属个人见解：E是对的

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=175348&replyID=1660274&skin=1

to Sacramento_CA:

In prep 46, these is no such option available as "will soar to a level more than one-third higher than is" so those two answers do not confict. I do remember see some example which omit that/those but leave verb (is/are) there.

So I guess E is better. (I also chose D when I first saw it )

u r in sacramento? I am in bay area ... glad to know some company here