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最佳答案：the first day of disappearance
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最佳答案：The very first day
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最佳答案：This is my first day in Sunshine Secondary School.
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最佳答案：It is the first day having a summer holiday todayToday is the first day of summe
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最佳答案：This is my first day of your pursuit
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最佳答案：Today is the first day of winter holiday
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最佳答案：Today is my first day to go to school.
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最佳答案：the first day I leave.I miss you
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最佳答案：第一是 the 1st： The first day with her, we had a great sex.第二是 the 2nd: The 2nd day
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最佳答案：the+序数词+day,序数词是基数词+th,(如four-fourth,eighteen-eighteenth)