Choose the correct sentences made from the given clues . Question 24. The dragon / fly over/ when / he / hear / the princess / cry / help. A: The dragon was flying over when he heard the princess crying for help. B: The dragon was flying over when he was hearing the princess to cry for help. C: The dragon flew over when he heard the princess to cry for help. D: The dragon flew over when he was hearing the princess cry for help.