第1个回答 2013-05-20
具体指某一天用on,what do people always do on Christmas Day? they go to parties.at一般指具体某个时间点或地点,比如at 3'o clock of sunday。in主要指具体时间段,如in saturday afternoon.
第2个回答 2013-05-20
What do people do at the Christmas Day? They use to go to gethering.
第3个回答 2013-05-20
Usually people in the Christmas do? They go to a party.