Once again, it is a question of habit.
1	Once	once	ADV	_	NumType=Mult	7	advmod	_	_
2	again	again	ADV	_	_	1	fixed	_	SpaceAfter=No
3	,	,	PUNCT	Comma	_	1	punct	_	_
4	it	it	PRON	PERS-SG	_	7	nsubj	_	_
5	is	be	AUX	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
6	a	a	DET	IND-SG	Definite=Ind|PronType=Art	7	det	_	_
7	question	question	NOUN	SG-NOM	Number=Sing	0	root	_	_
8	of	of	ADP	_	_	9	case	_	_
9	habit	habit	NOUN	SG-NOM	Number=Sing	7	nmod	_	SpaceAfter=No
10	.	.	PUNCT	Period	_	7	punct	_	_
