Answer and explanation

Correct answer: B. will be turned

  1. Step 1: The building does not act; it receives the action, so the future passive is needed.
Answer
will be turned.
Why not the others: will turn, is turning and has turned don't fit.

Practise more Non-finite verbs and passive.

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The old building into… | College English Test Band 4 (CET-4) - China