문제가 If you are unable to retrieve the truck yourself, you may send a representative who must present a valid identification card and a letter ___ that you authorize him or her to claim the vehicle on your behalf.이고,
a)indicates b)indicating c)indication d)indicated 답중에 b,d 햇갈리네요.
왜 현재분사 b)indicating이 답이죠? a letter을 꾸며준다는 것은 알겠는 데, 왜 indicated가 되지 못하나요?
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