题目

Jack wanted to know __________ when I reached the cinema last week.   A. how long had the film been on                 B. how long had been on the film   C. how long the film had been on                 D. the film had how long on 答案：C下列说法正确的是(    )A．增加生产资料的投入是提高农业产出的重要手段B．热带雨林迁移农业属商品农业C．分布在地广人稀地区的农业属粗放农业D．目前世界农业发展很不平衡