在昨天的早上 在去年的早上 在星期天的早上 在早上7点

yesterday morning,汗，去年的早上说不通吧？
on Sunday morning,
at 7 o'clock in the morning

yesterday morning, in the morning last year, on sunday morning, at 7 in the morning!
做个参考吧。

on yesterday morning , on last year mornings , on sunday morning,
at seven o'clock in the morning
应该是这个答案吧