we are going to clean the classroom ( )friday afternoon

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we are going to clean the classroom ( )friday afternoon
we are going to clean the classroom ( )friday afternoon

we are going to clean the classroom ( )friday afternoon
填on.在具体某一天上午或下午用on

on
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on
on可以加具体的某一天
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on
某一天(包括某天上午,下午,晚上)前用 on. 再如:
on the morning of New Year's Day

on
在星期几前面的介词用on