we need some students () Sports Day

问题描述:

we need some students () Sports Day

填介词on,Sports Day是具体的哪天,在具体的哪天都用介词on,比如on holiday,on Tuesday,on Christmas Day,而具体的时间点,几点几点,用介词at,比如at 10:30,at half past eight.多总结一些时间的固定搭配.