Complete the sentence with a Relative pronoun or a Relative Adverb: My book, _____________ I put into the trash bag, has been stained.

My book, _______which______ I put into the trash bag, has been stained.

Dịch: Cuốn sách của tôi, mà tôi đã cho vào túi rác, đã bị ố vàng.