【单选题】【消耗次数：1】
I go to the gym [填空] a week.
①
one
②
first
③
once
④
two
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设一组初始记录关键字序列为(25，50，15，35，80，85，20，40，36，70)，其中含有5个长度为2的有序子表，则用归并排序的方法对该记录关键字序列进行一趟归并后的结果为（）。
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