our school sports meeting will start on the morning of next saturday为啥用on 哥哥姐姐帮下忙吧~

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ourschoolsportsmeetingwillstartonthemorningofnextsaturday为啥用on哥哥姐姐帮下忙吧~ourschoolsportsmeetingwillsta

our school sports meeting will start on the morning of next saturday为啥用on 哥哥姐姐帮下忙吧~
our school sports meeting will start on the morning of next saturday
为啥用on 哥哥姐姐帮下忙吧~

our school sports meeting will start on the morning of next saturday为啥用on 哥哥姐姐帮下忙吧~
l因为这里具体到星期六,具体到某一天要用O9N

saturday,已经具体到了星期几,就要用on,如果去掉of next saturday,就用in

具体某一天的早上,下午或晚上,都用on
记得采纳哟