Choose the option that best completes the sentence.

The library, ______ was built in 1890, has recently been restored.

Answer and explanation

Correct answer: D. which

  1. Step 1: Identify the clause type. The relative clause is set off by commas, indicating a non-restrictive (non-defining) relative clause providing supplementary information about an inanimate antecedent ("The library").
  2. Step 2: In formal standard English, non-restrictive relative clauses modifying things must be introduced by the relative pronoun "which" rather than "that" or "what".
Answer
which.

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