如果“几月几日”是做句子的时间状语,那么就需要加个介词,例:
We had a big party on Christmas Eve.
They had a heated dicussion on Mercy Killing on January, 3rd.
如果“几月几日”是做句子的主语或宾语,或表语,那就不要加介词了。
例:My birthday is May, 12th.
Dec. 25 is said to be the day for Jesus Christ's birth.
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