一道GWD

springsound

20. GWD-30-Q20:
Researchers have announced that the magnetic fields emitted by one manufacturer’s security surveillance system, of which type there are 200,000 worldwide, can interfere with pacemakers and that this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.

A.    of which type there are 200,000 worldwide, can interfere with pacemakers and that
B.    of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and
C.    of which type there are 200,000 worldwide, they can interfere with pacemakers and
D.    200,000 of which type exist worldwide, interfering with pacemakers, and
E.    200,000 of that type existing worldwide and can interfere with pacemakers, and
这道题选A 我选D 请问OF WHICH 作何成分？为什么A对？

jessicasonia

D 句子结构不完整

好像 of which 修饰 magnetic fields, 意思是世界上有200,000个这种类型的magnetic fields?

elephantsmall

秒杀的方法是两个that从句的平行-只有A可以
of which 引导定语从句修饰system

lshlccER

D 句子结构不完整

好像 of which 修饰 magnetic fields, 意思是世界上有200,000个这种类型的magnetic fi ...
jessicasonia 发表于 2012-6-26 20:42

同意楼主所说，which指代的是one manufacturer’s security surveillance system。
把定语从句顺序倒回来就是: there are 200,000 of the manufacturer’s security surveillance system type worldwide.
of在这里的用法应该算是一种“同位修饰”，和both of us(我们两个人), four of us(当我们一伙是四个人的时候)的用法有点类似，of前面都是表明一个数量。当然也有three of us(当我们一伙大于3个人的时候)，此时of就又是表达“所属”了。

jessicasonia

同意楼主所说，which指代的是one manufacturer’s security surveillance system。
把定语从句顺序 ...
lshlccER 发表于 2012-6-27 20:32

为什么哪，为什么which不是magnetic fields？中心词是magnetic fields，这样不行吗？

lshlccER

为什么哪，为什么which不是magnetic fields？中心词是magnetic fields，这样不行吗？
jessicasonia 发表于 2012-6-28 06:41

要从语义判断哦，首先fields是复数，不能是一种type，而system可以：there are 200,000 of the manufacturer’s security surveillance system typeworldwide.而且撇开复数不管，某种类型的磁场全球有20000个，其实磁场在哪里都是一样的.整个地球就是一个大磁场.
==
umm..感觉说得不是非常清楚，可能需要mongmong再自行体会一下意思。

jessicasonia

嗯，好吧，我再去体会了~~~谢谢~

eyesoneye

斑斑~我想问问，我在Mforum上面看到一个非Ron的instructor解释说D还有一个错误是：
“Second, magnetic fields "interfering" with pacemakers is an incorrect verb tense. ”

这里不太明白耶，这个interfering的时态是怎么不对了？！

kittenalways

现在分词表同时发生的或反复性动作，与前面陈述一个具体的事实不符。并且无法表达情态动词的意思。