题目内容
12．tooth（复数）teeth．分析 tooth，名词牙齿的单数
解答 答案：teeth
tooth为名词，意为"牙齿"，其复数形式是特殊变化，把oo变为ee；即teeth．故填：teeth
点评 此题考查名词复数的特殊变化形式．平常要记牢此类变化，做题就会游刃有余了．
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