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That'why...为什么引导的是定语从句啊?也还原不回去啊,

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That'why...为什么引导的是定语从句啊?也还原不回去啊,
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答案和解析
That's why...引导的不是定语从句,因为why之前没有定语从句结构中的先行词;why出现在is之后,故它是表语从句.定语从句的结构应该是类似于下面的句子:
That is the reason why...
The reason why ... is that .
例如:
That is the reason why (=for which) he arrived late.
The reason why(for which) he was late was that his flight was delayed.