固定用法.
在New Year’s Day,May Day,Children’s Day,National Day前应该用on,在Easter,Halloween,Christmas,Spring Festival,Dragon Boat Festival 和Mid-Autumn Festival前用at.
简单记：看见这个节日中有Day,就用介词on,其余都用介词at.
Children get gifts ____ Christmas and ____ their birthdays.
Children get gifts ____ Christmas and ____ their birthdays.
A.on; on B.at; on C.in; in D.in; on答案是B,A为什么不可以
A.on; on B.at; on C.in; in D.in; on答案是B,A为什么不可以
英语人气：272 ℃时间：2019-08-20 17:33:59
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