In Monday morning ,we have math.

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InMondaymorning,wehavemath.InMondaymorning,wehavemath.InMondaymorning,wehavemath.应该是OnMondaymorning,

In Monday morning ,we have math.
In Monday morning ,we have math.

In Monday morning ,we have math.
应该是On Monday morning ,we have math.我们周一上数学
具体的某一天早上用On

周一早上，我们上数学课。。
so , how do you feel ? boring , or something else .