문제 내용: 밑줄 친 부분에 들어갈 말로 적절한 것은?
선택지 1: I see. When will we be getting the invoice from you?
선택지 2: Our department may not be able to pay within two weeks.
선택지 3: Can we send the payment to your business account on Monday?
선택지 4: Wait a minute. I thought the delivery costs were at your expense.