求这道英语被动语态习题讲解？

Question

we could ask someone to do the work privately without it _____.
A. be known B. being known C. to be known
这道题答案是B， 为什么？

Answer 1

without it being known. 介词短语作状语，是高中英语中的独立主格结构。
在独立主格结构中，通常是 （with或without）+独立主格逻辑主语+分词
eg We couldn't have finished the work wihout him helping us.
本题中，it是独立主格逻辑主语，being known是分词的被动式。