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It’s important to brush your _________ twice a day.
A. tooth   B. tooths      C. teeth
C

试题分析:根据语境可知此句的基本含义是每天刷两次牙是非常重要的,刷牙要用复数形式,故选C。
点评:英语中,可数名词的单数转换为复数形式有一定的规则,有的在词尾直接加s或es;也有的是不规则变化,比如man的复数形式是men,child的复数形式是children。对于这些不规则变化的单词的复数形式一定要记清楚。
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