单选题 The train stopped abruptly, making us wonder where we were.
  • A. all of a sudden
  • B. fast
  • C. slowly
  • D. quickly


【正确答案】 A
【答案解析】[解析] all of a sudden和abruptly都表示“突然”；fast：快地、迅速地；slowly：慢慢地；quickly：快地、立刻地。