it 指代that后面的从句Mark Twain is a great American writer
it在句子中做主语,所以是主语从句.
为什么这句话是主语从句?怎么看出来啊?
为什么这句话是主语从句?怎么看出来啊?
it's known to the world that Mark Twain is a great American writer.
it's known to the world that Mark Twain is a great American writer.
英语人气：435 ℃时间：2020-02-04 03:04:59
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