单选题 They planned to ______ the bridge but their bombs failed to explode.
  • A. blow off
  • B. blow up
  • C. blow down
  • D. blow out
【正确答案】 B
【答案解析】[解析] blow off把……吹掉；blow up把……炸掉；blow down把……吹下来；blow out吹熄。根据题意选B。