i'm going to see the docter _____tomori'm going to see the docter _____tomorrow afternoonA.\ B.on选哪一个?

i'm going to see the docter _____tomori'm going to see the docter _____tomorrow afternoonA.\ B.on选哪一个?
i'm going to see the docter _____tomor
i'm going to see the docter _____tomorrow afternoon
A.\ B.on
选哪一个?

i'm going to see the docter _____tomori'm going to see the docter _____tomorrow afternoonA.\ B.on选哪一个?
A
tomorrow afternoon 前不要介词