the result of the experiment was very good ,which we hadn't expectedWHICH为什么不能换成THAT呢

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the result of the experiment was very good ,which we hadn't expectedWHICH为什么不能换成THAT呢

the result of the experiment was very good ,which we hadn't expectedWHICH为什么不能换成THAT呢
the result of the experiment was very good ,which we hadn't expected
WHICH为什么不能换成THAT呢

the result of the experiment was very good ,which we hadn't expectedWHICH为什么不能换成THAT呢
因为定语从句中,“逗号”后面不能用that,
有逗号的定语从句叫非限定性定语从句,这种定语从句不能用that引导.
补充一下,介词后面也不要用that哦.

楼上的说法很正确。有逗号表示非限定性定语从句,后面不能加that。。
我补充一点,which可以指代前面整个句子,而that是没有这个功能的。从这个句子来看,which指代的就是前面整个句子,所以必须用which

which代指的是前面一句话,而THAT只能指词或词组