답변을 얻은 뒤 반드시 감사의 덧글을 남기고, 좋은 답변은 채택해 주시는 센스...
질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 :

2010년 종로 5월 어법 문제에요.
Sandra stopped ①to obey a red light at an intersection. While waiting for the light to turn green, her car suddenly died. It was a busy intersection, and the traffic behind her started growing. When the light turned green, and she had still not been successful at starting her car, the guy in the car directly behind her started to become very impatient, ②which he showed by honking his horn continuously as Sandra worked feverishly to get the car started again. Finally, in desperation at all the honking, Sandra got out of her car and ③approached the guy in the car behind her. “I can’t seem to get my car started,” Sandra said to him, smiling. “Would you be a sweetheart and go and see ④what you can get it started for me? I’ll stay here in your car ⑤leaning on your horn for you.”

정답은 4번 what을 if로 고치는 문제였습니다.
근데 2번에 which이건 대체 뭔가요? 주격? 목적격? 선행사는 대체.. ㅜ