---What’s that terrible noise?---The neighbors for a party.A. have preparedB. are preparin

问题补充：

---What’s that terrible noise?

---The neighbors for a party.

A. have prepared

B. are preparing

C. prepare

D. will prepare

答案：

A. have prepared

(答案→)B. are preparing

C. prepare

D. will prepare

解析：这是一组对话。上文，那可怕的噪音是什么？下文，邻居们正在聚会。表示说话时正在进行的动作或状态，用现在进行时，故选B。