求大神英语句子分析'''谢谢!What you can't do is leave it until a few days before the start of term.这句话是主语从句吗?宾语是什么?leave后面怎么出现了it?it在这里作什么呢?

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求大神英语句子分析'''谢谢!What you can't do is leave it until a few days before the start of term.这句话是主语从句吗?宾语是什么?leave后面怎么出现了it?it在这里作什么呢?
求大神英语句子分析'''谢谢!
What you can't do is leave it until a few days before the start of term.这句话是主语从句吗?宾语是什么?leave后面怎么出现了it?it在这里作什么呢?

求大神英语句子分析'''谢谢!What you can't do is leave it until a few days before the start of term.这句话是主语从句吗?宾语是什么?leave后面怎么出现了it?it在这里作什么呢?
完整的句子是
What you can't do is that you leave it untial a few days before the start of term.
你不能做的,就是“把它抛在一边,直到学期开始前几天才想起来”.
是主语从句 + 表语从句
这个句子主结构是 主语从句+系动词+表语从句