I want to buy a gift,____ is expensive.为什么这道题不能填which呢?

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I want to buy a gift,____ is expensive.为什么这道题不能填which呢?
我认为这句话完全可以用“I want to buy a gift which is expensive”.
其实我想求助的是非限定性定语从句是指代前句的一整句,还是只能指代前句的宾语呢?因为如上所示,似乎非限定性定语从句时指代一整句,但是今天我经理告诉我只能指代宾语?我现在都不知道哪个是对的呢?望告知,

不要太死板啊,虽然有逗号的是非限制性定语从句,说明主从句关系不是特别密切,但是后面出现了“expensive”昂贵的,当然指的是gift.
再问：谢谢，我了解expensive指的是gift。其实我并非指代这个句子，我想了解的是非限定性定语从句是指代前句的一整句，还是只能指代前句的宾语呢???
再答：一般情况下都是指代前面的整个句子，但是也可以指代前面的宾语

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