我的哥哥每天七点起床 should be accepted
I mean im pretty sure they want you to specify the morning
What a sentence!
My Chinese teacher corrected me by saying 起床 means "get up" specifically, and not wake up. Hope this helps!
It literally means "arise bed"
Why is 。。。每天早上七点都起床 not accepted?
Because 都 is not needed.