She luckily missed the air crash because she         on the way and was late for her flight.

   A．had a flat tyre                                          B．caught a bad cold   

   C．sped up                                                  D．broke down

She luckily missed the air crash because she ___ on the way and was late for her flight.

  A. had a flat tyre   B. caught a bad cold  C  sped up       D. broke down