This is the book ___ I told you about.
Answer and explanation
Correct answer: B. that
'That' or 'which' introduces a clause about a thing.
Answer: that.
Why not the others: who: 'who' refers to people. whose: it shows possession. what: it cannot introduce a relative clause after a noun.
Answer: that.
Why not the others: who: 'who' refers to people. whose: it shows possession. what: it cannot introduce a relative clause after a noun.
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