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求这道英语被动语态习题讲解?

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求这道英语被动语态习题讲解?
we could ask someone to do the work privately without it _____.
A.be known B.being known C.to be known
为什么?
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.