[文法] 請問選擇題 when, which..

[gastronomer (美食強迫症)]

請問
以下這題答案應該是when, 還是which呢?

I would like to visit you on the day _____ your father doesn't need to work.
(A) which  (B) when  (C) where  (D) in which

如果可以解說, 那就更好了!!
感謝大家指教!!


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→ zofloya:when
推 rogerkid:可以用when 或 on which~