问题补充：
----I don’t suppose the police know who did it.
----Well, surprisingly they do. A man has been arrested and now.
A. has being questioned
B. is questioning
C. has questioned
D. is being questioned
答案：
A. has being questioned
B. is questioning
C. has questioned
(答案→)D. is being questioned
解析：时态题。“我想警方不知谁干的这事。”“令人吃惊的是他们知道，他们逮捕了一个人并且正在审讯。”根据句意以及句中时间状语now应选现在进行时的被动语态形式。。
