why do you go to school ___ Saturdays this year?----

why do you go to school ___ Saturdays this year?----

题目
why do you go to school ___ Saturdays this year?----
答案
on
on用法:
(1)具体的时日和一个特定的时间,如某日、某节日、星期几等.如:
On Christmas Day(On May 4th),there will be a celebration.
(2)在某个特定的早晨、下午或晚上.如:
He arrived at 10 o’clock on the night of the 5th.
(3)准时,按时.如:
If the train should be on time,I should reach home before dark.
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