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 :

To protect you and your fellow passengers, the Transportation Security Administration (TSA) is required by law ① to inspect all checked baggage. As part of this process, some bags are opened and physically inspected. Your bag was among those ② selected for physical inspection. During the inspection, your bag and its contents may ③ have searched for prohibited items. At the completion of the inspection, the contents were returned to your bag. If the TSA screener was unable to open your bag for inspection because it was locked, the screener may have been forced to break the locks on your bag. TSA sincerely regrets ④ having to do this. However, TSA is not liable for damage to your locks ⑤ resulting from this necessary security precaution. 이 문제에서 틀린 부분이 3 번이라는데 왜 틀린 건가요??그리고 제가생각하기에는 4번도 having이아니라 to have가 되어야 할 것 같아서 틀린 것 같은데 4번은옳은 문장인가요??