英语the very thing the russian tsar did not allow...that was the very thing the russian tsar did not allow them to do.中的did在这儿起什么作用?不用可以吗?

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英语the very thing the russian tsar did not allow...
that was the very thing the russian tsar did not allow them to do.中的did在这儿起什么作用?不用可以吗?

这里的 did 是疑问句和否定句中一贯存在的助动词,是必须的.正如下面的简单例子:
陈述句:He walked to school.
疑问句:Did he walk to school?
否定句:He did not walk to school.

the russian....从句部分修饰the very thing。 去掉其他的部分,把 the russian....to do 看成一个完整的句子,这样容易理解了吧。

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