Question

应该是At New Year's Eve 还是 On New Year's Eve

Answer 1

是 On New Year's Eve，它的意思是：在新年前夜。
at用于指某一个点的时间。例如，几点、几刻。
on用于指具体的某天和上下午等。

eve 英 [ i:v ] 美 [ i:v ]
n.前夕，前夜 重要事件的前夕 傍晚

复数： eves
双语例句：
1.Richard had turned up on Christmas Eve with Tony.
理查德和托尼在圣诞夜一道露面了。
2.Eve walked briskly down the corridor to her son's room.
伊芙步履轻快地穿过走廊来到儿子的房间。
3."Send her away," Eve said in a cold, hard voice.
“把她打发走。”伊芙冷酷无情地说道。

Answer 2

on New Year's Eve
还有： On Christmas Eve ;
on Mid--Autumn Day
简析： 在具体的某一天,用介词 on

Answer 3

应该是
On New Year's Eve
at是指时间点，比如at ten(10点钟)
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Answer 4

用ON，不用AT