we are going to clean the classroom ( )friday afternoon

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填on.在具体某一天上午或下午用on

on
完善下回答吧，知友们期待您耐心详细的解答

on
on可以加具体的某一天
希望我的回答可以帮助你！

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

what are we going to we are going to travel by What are we going to do today? We are going to go there What are we going to do now? are we going to see different places? we are going to hawaii for v______ We’are going to take the underground when are we going to start? are to piay we going tomorrow footbaii We are going to take photos there. Where are we going to have it? We are going to Japan 作文 we are going to g_____a puppet show. We are going to (play tennis). We are going to visit relatives on . we are going to beijing (beijing 提问) where are we going to 什么 from