PEOPLE HAVE DISCOVERED A NEW SOURCE OF ENERGYA

Question

39. People have discovered a new source of energyA. A new source of energy has discovered B. A new source of energy was discoveredC. A new source of energy has been discovered D. A new source of energy has been discovered

Answer

39. People have discovered a new source of energyA. A new source of energy has discovered B. A new source of energy was discoveredC. A new source of energy has been discovered D. A new source of energy has been discovered

PEOPLE HAVE DISCOVERED A NEW SOURCE OF ENERGYA

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