than is the case 是什么结构（is前面缺主语）

A higher proportion of Americans go on to higher education than is the case in Britain.

这个是什么结构？

the case = what actually exists or happens

A higher proportion of Americans go on to higher education than is the case in Britain.

than分析为连词引导比较状语从句，than不作成分，从句省略了形式主语it 及外置的that主语从句。补全省略则为：

A higher proportion of Americans go on to higher education than it is the case in Britain that Britons do.

划线部分分别是主句的比较项和从句必须省略的比较对应项。

曹荣禄 -

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yhm123123 1秒前

是定语从句，than前是名词education, than= than higher education which..., 相当于一个关系代词，所以是定语从句。