We have no classes ------ the afternoon of Wednesday.中间横线处填 in 还是 on

We have no classes ------ the afternoon of Wednesday.中间横线处填 in 还是 on
We have no classes ------ the afternoon of Wednesday.中间横线处填 in 还是 on

We have no classes ------ the afternoon of Wednesday.中间横线处填 in 还是 on
on

年、月份都用in
具体日期都用on
具体时间都用at
on

填on，具体的时间前介词用on，此句中因为有Wednesday，也就是在具体某一天的下午，所以要用on，如果没有具体的某一天，则用in