( )a cold september day .( )填in 还是on 原因.:$(supplement)

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()acoldseptemberday.()填in还是on原因.:$(supplement)()acoldseptemberday.()填in还是on原因.:$(supplement)()acolds

( )a cold september day .( )填in 还是on 原因.:$(supplement)
( )a cold september day .( )填in 还是on 原因.
:
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( )a cold september day .( )填in 还是on 原因.:$(supplement)
on,在特指的某一天用on.