【题目】We should brush our teeth ________ a day. （ ）
A. two B. twice C. two times
【答案】B
【解析】
句意：我们一天应该刷牙......。这里是次数，表示两次用单词twice“两次”，A选项是基数词不合适，C选项表达方式不正确。故答案为：B.
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