These surveys indicate that many crimes go ___by the police mainly because not all victims report them.
A . unrecorded
B . to be unrecorded
C . to have been unrecorded
D . unrecording
答案：A
解析：这里主要是过去分词表动宾关系，故选A
翻译: 调查显示很多犯罪事实没有被警察纪录在案，主要因为很多受害人没有报案。
