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We were shocked by the news which they cheated in the exams.

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We were shocked by the news which they cheated in the exams.为什么改错时要把which换成that
We were shocked by the news which they cheated in the exams.
在这里,that they cheated in the exams 不是做the news 的定语从句,
而是做同位语从句,而我们知道同位语从句只由that来引导
当that引导定语从句,并指代物时,即在句中作主语或者宾语,可以和which互换(仅限制为限制性定语从句中) 如It is my car that/which is black.
但that引导定语从句,并指代的是人时,不可与which互换.因为which可以指代物或者前面说的一句话,但不可以指代人.
that不引导非限制性定语从句,而which可以,如 It is my car ,which is black.
所谓同位语从句,就是紧跟在一个名词如 news/idea/advice/suggestion,etc.之后,
所表达的内容是前面的名词的具体内容的
并且句意无论在语法上还是在意义上都完整的句子.同位语从句只由that引导,要记住了.