--- What do the police think about the murder?
--- I’m not sure. But I want anyone who the clue to contact the police actively.
A. have
B. has
C. to have
D. are having
网友回答
A. have
(答案→)B. has
C. to have
D. are having
解析：句意：警方怎么考虑这个凶手？——我不确定。但是我想要任何有线索的人积极的同警方联系。结合语境可知定语从句描述的是客观性动作，故用一般现在时态。主语who是单数第三人称，故谓语动词用单数。选B。