As so often is the case,stating that principle doesn't ease the challenge of line-drawing.
一般常见的用法是“as is often the case“。传统语法认为as 是关系代词,引导非限制性定语从句,as 指代整个主句,在从句中作主语。那在”As so often is the case”中so often为什么能提前呢,这是一种倒装吗?
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