20 GWD17-Q20: Construction of the Roman Colosseum, which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian,
was completed a decade later, during the reign of Titus, who opened the Colosseum with a one-hundred-day cycle of religious pageants, gladiatorial games, and spectacles.
- which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian,
- officially known as the Flavian Amphitheater, begun in A.D. 69, during the reign of Vespasian, and
- which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian, and
- officially known as the Flavian Amphitheater and begun in A.D. 69, during the reign of Vespasian it
- officially known as the Flavian Amphitheater, which was begun in A.D. 69, during the reign of Vespasian, and
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