It is reported that by careful questioning the police managed to the information they were looking for.
A. add up
B. set down
C. dig out
D. set up
网友回答
A. add up
B. set down
(答案→)C. dig out
D. set up
解析：考查动词短语辨析：A. add up 加起来，B. set down记下，C. dig out 挖掘， 挖走，找出来，D. set up建立，句意：据报道通过仔细询问，警察最终找出他们想要的信息。选C。