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在大全987-174中 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. C项是正确答案，但是对于C项末尾的they may use，和后面的as连起来好别扭啊。 这个they应该指elephant吧，莫非use as中间省略了such sounds? 对省略的尺度实在是把握不助，use as 可以这样用吗？盼nn解答，谢谢！
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发表于 2006-12-9 23:26:00
