题目内容：

the police ()to find the truth of the murder A.has being trying B.has been tried C.have been tried
D.have been trying

优质解答

the police ()to find the truth of the murder
A.has being trying
B.has been tried
C.have been tried
D.have been trying
选D
police表示复数,用have,have后要接动词过去分词,排除AB.be tried表示被动,排除C