单选题 When I asked about his son, he did not answer at first, but then he ______ in tears.
  • A. shut down
  • B. let down
  • C. took down
  • D. broke down
【正确答案】 D
【答案解析】shut down：(电脑)关机，关停；let down使……失望；take down：记下；break down：情绪失控，突破，分解，拆除。