Flay Day is a legal holiday only in the state of Pennsylvania,___Betsy Ross sewed the first American flag.
A.which
B.where.
C.that
D.has
C,非限定性定语从句
关系代词which who who that(看情况)要在所引导的从句里做句子的主干成分
关系副词不做主干成分where,when how,做地点状语,时间状语,方式状语
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