填空:He is going camping at 6:00 ( ) the morning of July 21st.填on还是in还是都可以?

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填空:He is going camping at 6:00 ( ) the morning of July 21st.填on还是in还是都可以?
填空:He is going camping at 6:00 ( ) the morning of July 21st.填on还是in还是都可以?

填空:He is going camping at 6:00 ( ) the morning of July 21st.填on还是in还是都可以?
on 当出现具体的日期的时候,前面介词一定是on
7月21日的早晨----具体的日子,介词用on

on 特指

morning,noon,afternoon,evening,night这些词只要前头有形容词,或者有后置定语(即只要有定语修饰)那么前面的介词一律用介词on