题目内容
3．Brush your teeth at leasttwice（two） a day：in the morning and before bedtime．分析 一天刷牙至少两次，早晨和睡前．
解答 答案：twice．结合句意可知这里是说一天刷牙两次，表示频率，所给单词two是基数词二，twice表示两次，故填twice．
点评 once
twice
以后一般就是数字+times
three times
four times
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