아래 문장들이 다 한군데씩 틀렸다고 그러는데.. -_-a 어디가 틀린지 잘 모르겠어요 ^^;;;;; 좀 봐주세요~~~ 1. A letter of credit is often used to companies to finance the movement of goods between countries. 2. A person is experienced with horses can estimate their ages by examing their teeth. 3. The instructor had gone over the problems many times before the students will take the final examination. 4. Among all animals, man stands in a unique relation to time because he stands open to a future in which the present condition of life is transformed. 5. An electrician repairs, installments, operates, or maintains devices.