Question: when was the last time the olympics were held in china
[{'answer': '2008 Summer Olympics', 'provenance': [{'wikipedia_id': '8341323', 'title': 'China at the Olympics', 'start_paragraph_id': 62, 'start_character': 99, 'end_paragraph_id': 62, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::History.:Summer Games.:2008.\n'}]}]