选择C.因为只有of the same age能成立.the same age +as 一般会这样,表示一个对比.而of the same age才能表示同龄.
They are all 27 (years old).
Both/Three of us are all 27 (years old).
I travelled（have travelled） to South Africa in my Spring Festival holiday.
where have you travelld（did you travel） in your Spring Festival holiday.