请问关系代词与关系副词的区别？

assfgrtrtr

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

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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

[em01][em01][em01]

himba

that 不能用于非限定性定语从句，答案是B