单选题 Since the island soil has been barren for so many years, the natives must now______much of their food.
【正确答案】 B
【答案解析】deliver“投递，发表”；import“进口，输入”；produce“生产，创作”；develop “发展，开发”。根据句意和各个选项的意思可知，正确答案是B。