Many of the crimes have gone( ) ,because some people dare not report them to the police.
A to be unnoticed B unnoticed C unnoticing D to have been unnoticed
选B
这是一句非谓语的题目
因为cromes是被注意的,所以要用表示被动的形式
C排除
又因为前面时态是have gone
to be done表示的是将来
to have been done也不合适
所以选B