题干
America has more than fifty states, ______, Kentucky, is the place _______ Abraham Lincoln was born.
A：one of it; where
B：one of which; where
C：one of that; which
D：one of which; which
答案(点此获取答案解析）
B
，其中
是正整数，且
,
表示非负实数
的整数部分，例如
，
．若
，则
( )．