The book, ______ I had read twice, still confused me.
Answer and explanation
Correct answer: D. which
- Step 1: A non-restrictive clause between commas takes 'which', not 'that'.
Answer
which.
Why not the others: that, what and whom don't fit.
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More Advanced grammar questions
- Had it not been for your help, we ______ the deadline.
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- It was not until she opened the letter ______ she learned the truth.
- He walked slowly along the beach, ______ in thought.
- The more she practised, ______ she became.