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We often see sentences with the focus on 'not until' as in:
It was not until he came back that I stopped reading.
I wonder if we can use 'it was...that' structure for a positive sentence as in:
It was until he came back that I worked on my composition.
I'd never seen such a sentence as this until one day I met with it in a test paper set by a Chinese teacher of English. I doubt if the sentence is all right. Could you tell me? Thank you.
it was until 
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