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

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：由What’s=What is可知，现在在出声音；进而知道“邻居们正在为一个晚会作准备”，所以用现在进行时态。再说，已经准备好了或者将作准备，我们不可能听得到声音，问句也就不成立了，排除A和D。