Cleaner fish clean the teeth of bigger fish,they swim int th

问题描述:

Cleaner fish clean the teeth of bigger fish,they swim int the m________of bigger fish,
1个回答 分类:英语 2014-11-27

问题解答:

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mouth嘴 所以横线山填ouths,mouth的复数形式.因为前面也是复数形式:teeth
 
 
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