问题: 英语句子的解释
The British usually expect one or two snowfalls each year but the amount of snow rarely affects everyday life. However, this week Britain has had the worst snow it has seen in around 18 years.
it has seen in around 18 years应该是snow的定语，为什么不是which而是it?为什么是it?
解答:
先行词是 snow 它的前面有 worst 最高级形容词 应该用 that 而 that 在从句里做宾语，可以省略。 it 是定语从句中的主语。
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