Australia produces 95 per cent of the world's precious opals.

  • a. Is Australia produces 95 per cent of the world's precious opals?
  • b. Does Australia produces 95 per cent of the world's precious opals?
  • c. Does Australia produce 95 per cent of the world's precious opals.
  • d. Do Australia produces 95 per cent of the world's precious opals?
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