How about this dictionary?Very useful .I'll buy it ____expensive

问题描述:

How about this dictionary?Very useful .I'll buy it ____expensive
—How about this dictionary?
—Very useful.I’ll buy it,_______expensive it is.
A.and B.or C.however D.though
为什么答案是C,D为什么不行?

如果用D后面应该 it is expensive.
尽管它很贵
所以要选C,无论它有多贵