单选题 The chairman of the company said that new techniques had ______ improved their production efficiency.
  • A. violently
  • B. severely
  • C. extremely
  • D. radically
【正确答案】 D
【答案解析】[解析] D项(根本上、本质地)与A(猛烈地，激烈地，极端地)、B(严格地，激烈地)和C(极端地、非常地)相比，更符合句意。所以，答案为D。