A recording system was so secretly installed and operated in the Kennedy Oval Office that even Theodore C. Sorensen, the White House counsel, did not know it existed.
What I dont understand is how do you know the "it" points to recording system or the oval office here? this is from the OG.. I dont think any of these answers are fine/ Any inputs?
Idiom + Diction
- Idiom 'so X that Y' is used properly.
- Usage of commas makes sentence clear.
Well to answer your question, I would say that we are emphasizing on 'A recording system' by placing it in the beginning of the sentence so 'it' should refer to 'recording system'.