Question

I don't know............... took my book

Answer 1

I don't know who took my book .

Explanation:

• A relative pronoun is a word that develops a relation between a dependent  clause and an independent clause.
• A clause beginning with a relative pronoun retains a question in it.
• Such as Which one? How many? or What kind? Who, whom, what, which, and that are all relative pronouns.

So in this sentence the relative pronoun will be "who".

I don't know who took my book .

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