The everyday life of a policeman or detective is ______.

A．prefer to wait for the criminal to give himself away
B．spend a lot of effort on trying to track down their man
C．try to make a quick arrest in order to keep up their reputation
D．usually fail to produce results

A．he is an expensive public servant
B．he must always behave with absolute legality
C．he is obliged to break the law in order to preserve it
D．he feels himself to be cut off from the rest of the world