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jixuewei

1.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（C）
(E) Originating, it is believed, from a small area on their foreheads, low-frequency sounds are emitted by elephants that may be used
这道题的答案选C 想了半天也不明白为什么 逗号后的that这样用可以吗 个人觉得A更好，大全的解释很模糊 就说按照believe的用法 只有C对。。希望高手指点。。

jixuewei

明白了~~谢谢~~

myungryong

A错的原因是believed在意思上应该修饰sounds但是believed在句首只能修饰elephants
在C当中 believed to originate from a small area on their foreheads 插入语 that修饰sounds 还有that在从句当中作宾语