问题描述：
some festivals are held to honor the dead
Some festivals are held to honor the dead or satisfy the ancestors,-__might return either to help or to do harm.
A which
B who
C that
选什么为什么
Some festivals are held to honor the dead or satisfy the ancestors,-__might return either to help or to do harm.
A which
B who
C that
选什么为什么
问题解答：
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