want to do vs want to vs want

A: What does your brother want to buy? B: I don't know __________. 1. what he wants to buy 2. what he wants to 3. what he wants Which is correct in the blank?
6 years ago
Asked 6 years ago
Rocky

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I don't know what he wants to buy.
Answered 5 years ago
Vô Thường

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