( )a hot morning,he went to the pool with his uncle.A、On B、In C、At D、Of为什么?

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( )a hot morning,he went to the pool with his uncle.
A、On B、In C、At D、Of
为什么?

选A
hot 修饰morning,表具体时间,一个天气很热的早晨 前面应用on
只要时间前面有修饰词,要用on

A

选on
on the morning是固定搭配指确切的某一个早上

on
a hot morning指某一个特定的早晨