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填on 只是表示“早上”时,用in the morning 当表示在“某个具体的早上”,如此句中的“在圣诞节早上”,就得用on,再如 on the morning of April 23,2009 on the morning of his father's death 等等
海诺地暖
圣诞老人用Santa Claus和Father Christmas The Father Christmas begins to give out the gifts in the morning on Christmas day.
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