___i really don't like art,i find his work impressiveas sincewhy?

___i really don't like art,i find his work impressiveas sincewhy?
___i really don't like art,i find his work impressive
as since
why?

___i really don't like art,i find his work impressiveas sincewhy?
since,
as和since相同的意思是既然由于,都是表示原因的连词,但用since时,带有“不好,勉强”的意味在里面,而as则是陈述既成事实,不含有这样的意味.
从really看,有一种勉强的意味,所以选since.