I have bought the book my teacher says is very useful.

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diamondcutter

Senior Member
Joined
Oct 21, 2014
Member Type
English Teacher
Native Language
Chinese
Home Country
China
Current Location
China
I have bought the book my teacher says is very useful.

Source: https://www.cpsenglish.com/question/38169

On the website above, a Chinese teacher says it’s a correct sentence. I’d like to know whether it makes sense to your native speakers’ ear. Is it necessary to put “which/that” in the sentence like this?

I have bought the book which/that my teacher says is very useful.
 
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