请教一道语法题

merrychord

． Believed to originate from a small area on their foreheads,elephants emit low-frequency sounds that may be used as a "secret language" to communicate with other members of the herd.
(A) Believed to originate from a small area on their foreheads,elephants emit low-frequency sounds that may be used
(B) Elephants emit low-frequency sounds that are believed to originate from a small area on their foreheads, and they may use this
(C) Elephants emit low-frequency sounds,believed to originate from a small area on their foreheads,that they may use
(D) Originating,it is believed ,from a small area on their foreheads;elephants emit low-frequency sounds they may use
(E) Originating,it is believed,from a small area on their foreheads,low-frequency sounds are emitted by elephants that may be used
为什么不选e?

zyh79

that may be used语法上修饰elephants，逻辑上应该指待sounds，矛盾
对了，这题应该是c吧
a.逻辑错误。d.；前后为完整主谓结构。b.this 指代好像有问题 c.that在这里算不算非限制性定语从句，若是，则也错!

merrychord

十分谢谢指点，仔细看看原来自己犯了这么一个愚蠢的错误，没看到elephants被that may be used修饰了

Kilroy

C里面的THAT到底做什么成分呢？

princess

that引导的是后面的限定性定语从句，修饰sounds

Kilroy

我是第一次看到that前面有逗号，是做做非限制性定语从句吗？

sandwolf

their　foreheads应该是就近修饰吧，要是选Ｅ不就是修饰了sounds嘛，本来是修饰大象的。

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zyh79

that前有，确实很不常见，不过我见过这样一题:
A, such as B, that。。。。(好像是对的)

z_weining

是否可以这么来解体。
a,Believed to originate 的动词发起者是elephants，不对，扔！
b,this的指代有问题，如果要指代sounds，那也要用those，不对，扔！
c,没明显语法错误
d，Originating的动词发起者是elephants，不对，扔！
e,that may be used中的动词发起者是elephants，不对，扔！

所以整个题目，只考一个东西，就是动词，所以是不是载做语法时，应该从动词及其发起者作为突破！因为动词可以牵涉很多个语法点，尤其是逻辑的合理性！