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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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