单选题 The researchers have just {{U}}completed{{/U}} a study of driving situations.
  • A. started
  • B. finished
  • C. changed
  • D. made
【正确答案】 B
【答案解析】[解析] complete“完成”，四个选项：start“开始”；finish“完成”；change“改变”；make“使得”。