Which was very expensive.
1	Which	which	PRON	WDT	PronType=Rel	4	nsubj	4:nsubj	_
2	was	be	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	4	cop	4:cop	_
3	very	very	ADV	RB	_	4	advmod	4:advmod	_
4	expensive	expensive	ADJ	JJ	Degree=Pos	0	root	0:root	SpaceAfter=No
5	.	.	PUNCT	.	_	4	punct	4:punct	_
