[題目] on which, in which 或 at which?

[trtr112 (pk)]

 各位先進,

  有一句子是這樣`: There are certain times when we need our friends.

  請問這裡的 when 如果要用"介詞 + 關代"替換, 是不是用 in which比較好呢?

  改為: There are certain times in which we need our friends.


   謝謝各位!

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