The police refused to the clues they were working on.
A. exhibit
B. disclose
C. expose
D. discern
网友回答
A. exhibit
(答案→)B. disclose
C. expose
D. discern
解析：考查动词词义辨析。本题句意是警方拒绝透露他们正在调查的线索。
disclose透露, 使显露： exhibit 展览, 展出, 显示, expose 暴露,discern 认出, 发现, 辨别,识别。B 吻合句意。