Question: when did they start building the three gorges dam
[{'answer': 'December 14 , 1994', 'provenance': [{'wikipedia_id': '65192', 'title': 'Three Gorges Dam', 'start_paragraph_id': 8, 'start_character': 238, 'end_paragraph_id': 8, 'end_character': 256, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]