0 It's correct. 'Only then' = not until that time. 0-
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10First they tried to explain it in their own words and give some examples, and 11b10only then did they hit12b10 the books to read something more on the given subject and try to do a few exercises. 12br
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then What about 'only then they did hit ...'
'did they hit..' is normally question order. isn't it?