怎样判断非限定性定语从句的which 指代的是前面的句子 还是某个词?

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怎样判断非限定性定语从句的which 指代的是前面的句子 还是某个词?

看句子意思呀,比如:1)He gave me a toy bear as birthday present,which made me very happy.2)He gave me a toy bear on my birthday,which is a present I was longing for.很显然第一句指代前面句子,因为是他送...