求解两道GWD语法题。。。。。。！

Uya

GWD-10-Q20
In the mid-1970’s, 【since birds  were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced】automobile emissions.

A.    since birds were overcome by pollution, and routinely falling from the sky above Los Angeles freeways, this prompted officials in California to devise a plan that reduced
B.    same as A
C.    birds had been overcome by pollution and routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan that reduced
D.    birds overcome by pollution routinely fell from the sky above Los Angeles freeways, prompting officials in California to devise a plan to reduce
E.    birds overcome by pollution and routinely falling from the sky above Los Angeles freeways, were prompting officials in California to devise a plan to reduce

D




GWD-10-Q37:GWD-11-26
【On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow】, as seen in the rings visible in the cross sections of their trunks.

A.    On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow
B.    On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth
C.    On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles
D.    Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate
E.    Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow
答案E
麻烦大牛们解析一下。。。。THX

mlvince

第一个a）this prompt  c）had been  e）were     ？
感觉，我菜鸟也不是很明白

Uya

第一个a）this prompt  c）had been  e）were     ？
感觉，我菜鸟也不是很明白

-- by 会员 mlvince (2011/3/19 23:49:57)

D这样说birds overcome by pollution routinely ...没有问题？

jy4780163

第一道题A 选项 逗号and 后面要加个完整的句子或者和前面并列的东西~这里falling  不平行~另外this 不能单独当代词使用~后面要加名词~it可以 直接当代词使用~
C 选项 过去完成时 没必要~

jy4780163

第二题 A are应该是is
B it is believed 错了
C 加了个which 句子没有 谓语动词了~
D believed 前面的逗号 让这个句子也没了 谓语动词~

jy4780163

第一题E选项我感觉过去进行时，没必要。前面那个看着也不舒服~这个都在陈述一个过去时点的事情 过去式就可以了

Uya

第二题 A are应该是is
B it is believed 错了
C 加了个which 句子没有 谓语动词了~
D believed 前面的逗号 让这个句子也没了 谓语动词~

-- by 会员 jy4780163 (2011/3/20 0:44:57)

It is believed在GMAT中是不是一般不用，在这里是因为IT没指代么
the rate...is...不对？

jy4780163

IT IS believed 这个是个句子啊。。不能做插入语。。又没有连接词~

jy4780163

我的错~，我才发现这个好像是个倒装句。。头回见被动语态的倒装句。。。被动语态。。这个到底是不是倒桩。。。

Uya

IT IS believed 这个是个句子啊。。不能做插入语。。又没有连接词~

-- by 会员 jy4780163 (2011/3/20 11:23:33)

嗯嗯i see i see...
3Q