【题目】I'm afraid I you with a great many questions. Thank you a lot, sir.
A.have bothered
B.appreciated
C.have contacted
D.impressed

【答案】A
【解析】句意：恐怕我已经麻烦了你许多问题，非常感谢您。A. have bothered“麻烦”；B. appreciated“欣赏，感激”；C. have contacted“交往，接触”；D. impressed“铭记”。此处指已经问了许多问题，动作已经完成用现在完成时，故选A.