题目内容：

to find out the murderer,the policeman questioned the _______.
A involved people B people involoved C involving people D people involving
要说为什么

优质解答

B
为了查出凶手,警察审问了每个卷入案件的人
完整的句子是
to find out the murderer,the policeman questioned the people who were involved.这里who were省略,由involved作为people的后置定语.