What did you choose?
( What ( ( ( did you ) choose ) ? ) )
(ROOT (SBARQ (WHNP (WP What)) (SQ (VBD did) (NP (PRP you)) (VP (VB choose))) (. ?)))
Was it the cheapest one which you chose?
( ( ( ( Was it ) ( the ( cheapest one ) ) ) ( which ( you chose ) ) ) ? )
(ROOT (SQ (VBD Was) (NP (PRP it)) (NP (DT the) (JJS cheapest) (CD one)) (SBAR (WHNP (WDT which)) (S (NP (PRP you)) (VP (VBD chose)))) (. ?)))